Kohler Single Cylinder Engine Specs | Torque Values and Sequences for Fasteners | Identification & Torque Settings of Most Commonly Used Grades of Bolts

Kohler K-Series and Magnum Single Cylinder Engine Specifications and Tolerances
(All dimensions in inches.)

Model (Horsepower @ 3,600 rpm) K90/K91
(4hp @ 4,000 rpm) K141 (6¼hp)
K160 (6.6hp)
K161 (7hp) K181 (8hp) K241 (10hp) K301 (12hp) K321 (14hp)
K341 (16hp)
K361 (18hp)
(Over Head Valve)

General Information
Bore x Stroke STD. 2.375"
.010" 2.385"
.020" 2.395"
.030" 2.405"
x 2.000" 6¼ & 6.6hp - STD. 2.875"
7hp - STD. 2.938"
.010" 2.948"
.020" 2.958"
.030" 2.968"
x 2.500" STD. 2.938"
.010" 2.948"
.020" 2.958"
.030" 2.968"
x 2.750" STD. 3.251"
.010" 3.261"
.020" 3.271"
.030" 3.281"
x 2.875" STD. 3.375"
.010" 3.385"
.020" 3.395"
.030" 3.405"
x 3.250" STD. 3.500"
.010" 3.510"
.020" 3.520"
.030" 3.530"
x 3.250" STD. 3.750"
.010" 3.760"
.020" 3.770"
.030" 3.780"
x 3.250" STD. 3.750"
.010" 3.760"
.020" 3.770"
.030" 3.780"
x 3.250"

Cubic Inch Displacement 8.86 16.23 (6¼hp)
16.95 (7hp) 18.64 23.85 29.07 31.27 35.90 35.90

Compression Ratio ? 5.93:1 (6¼hp)
6.2:1 (7hp) 6.8:1 5:1, 5.4:1 or 7.1:1 (See note 8) 6.1:1, 6.6:1 or 8.6:1 (See note 8) 6.6:1, 7:1 or 9:1 (See note 8) 7.4:1 9.2:1

Operating RPM (maximum) 4,000 3,600 3,600 3,600 3,600 3,600 3,600 3,600

Balance Gear
Shaft O.D. New - - - .4998" (min.)
.5001" (max.) .4998" (min.)
.5001" (max.) .4998" (min.)
.5001" (max.) .4998" (min.)
.5001" (max.) .4998" (min.)
.5001" (max.)

Wear Limit
(maximum) - - - .4996" .4996" .4996" .4996" .4996"

End Play - - - .002" (min.)
.010" (max.) .002" (min.)
.010" (maz.) .002" (min.)
.010" (max.) .002" (min.)
.010" (max.) .002" (min.)
.010" (max.)

Camshaft
End Play (See note 9) .005" (min.)
.020" (max.) .005" (min.)
.010" (max.) .005" (min.)
.010" (max.) .005" (min.)
.010" (max.) .005" (min.)
.010" (max.) .005" (min.)
.010" (max.) .005" (min.)
.010" (max.) .005" (min.)
.010" (max.)

Connecting Rod
Running Clearance
(See note 9) Big End Diameter
(maximum) STD. .938"
.010" .928 STD. 1.1875"
.010" 1.1775" STD. 1.1875"
.010" 1.1775" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"

Rod to Crankpin .001" (min.)
.0025" (max.) .001" (min.)
.002" (max.) .001" (min.)
.002" (max.) .001" (min.)
.002" (max.) .001" (min.)
.002" (max.) .001" (min.)
.002" (max.) .001" (min.)
.002" (max.) .001" (min.)
.002" (max.)

Rod to Crankpin Wear Limit
(maximum) .003" .0025" .0025" .0025" .0025" .0025" .0025" .0025"

Rod to Piston Pin .0007" (min.)
.0008" (max.) .0006" (min.)
.0011" (max.) .0006" (min.)
.0011" (max.) .0003" (min.)
.0008" (max.) .0003" (min.)
.0008" (max.) .0003" (min.)
.0008" (max.) .0003" (min.)
.0008" (max.) .0003" (min.)
.0008" (max.)

Rod to Journal Side Clearance .010" (min.)
.025" (max.) .010" (min.)
.025" (max.) .010" (min.)
.025" (max.) .010" (min.)
.025" (max.) .010" (min.)
.025" (max.) .010" (min.)
.025" (max.) .010" (min.)
.025" (max.) .010" (min.)
.025" (max.)

Wrist Pin Hole (Small End) I.D. .5630" (min.)
.5633" (max.) .6255" (min.)
.6258" (max.) .6255" (min.)
.6258" (max.) .8596" (min.)
.8599" (max.) .8757" (min.)
.8760" (max.) .8757" (min.)
.8760" (max.) .8757" (min.)
.8760" (max.) .8757" (min.)
.8760" (max.)

Crankshaft
Main PTO and
Flywheel
End O.D. New (max.) .9844" 1.1814" 1.1814" 1.5749" 1.5749" 1.5749" 1.5749" 1.5749"

Wear Limit
(maximum) .9841" 1.1811" 1.1811" 1.5745" 1.5745" 1.5745" 1.5745" 1.5745"

Crankpin New (max./min.)
(See note 9) STD. -
.9360"/.9355"
.010" -
.9260"/.9255" STD -
1.1860"/1.1855"
.010" -
1.1760"/1.1755" STD -
1.186"/1.1855"
.010" -
1.176"/1.1755" STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700" STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700" STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700" STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700" STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700"

Wear Limit
(maximum) STD. .9350"
.010" .9340" STD. 1.1850"
.010" 1.1840" STD. 1.1850"
.010" 1.1840" STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690" STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690" STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690" STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690" STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690"

Out of Round (maximum) .0005" .0005" .0005" .0005" .0005" .0005" .0005" .0005"

Taper (max.) .001" .001" .001" .001" .001" .001" .001" .001"

End Play (See note 9) .004" (min.)
.023" (max.) .002" (min.)
.023" (max.) .002" (min.)
.023" (max.) .003" (min.)
.020" (max.) .003" (min.)
.020" (max.) .003" (min.)
.020" (max.) .003" (min.)
.020" (max.) .003" (min.)
.020" (max.)

Cylinder Bore
Standard Size Cylinder Bore Diameter New (See note 9) 2.3745" - 2.3755" (max.) 2.9370" - 2.9380" (max.) 2.9370" - 2.9380" (max.) 3.2505" - 3.2515" (max.) 3.3745" -
3.3755" (max.) 3.4995" -
3.5005" (max.) 3.7495" - 3.7505" (max.) 3.7495" - 3.7505" (max.)

Maximum Wear Limit 2.378" 2.941" 2.941" 3.254" 3.378" 3.503" 3.753" 3.753"

Cylinder Bore Diameter for Oversize Piston/Rings .010" = 2.385"
.020" = 2.285"
.030" = 2.405" .010" = 2.9475"
.020" = 2.9575"
.030" = 2.9675" .010" = 2.9475"
.020" = 2.9575"
.030" = 2.9675" .010" = 3.260"
.020" = 3.270"
.030" = 3.280" .010" = 3.385"
.020" = 3.395"
.030" = 3.405" .010" = 3.510"
.020" = 3.520"
.030" = 3.530" .010" = 3.760"
.020" = 3.770"
.030" = 3.780" .010" = 3.760"
.020" = 3.770"
.030" = 3.780"

Maximum Out of Round .003" .003" .003" .003" .003" .003" .003" .003"

Maximum Taper .003" .003" .003" .002" .002" .002" .002" .002"

Cylinder Head
Maximum Out of Flatness .003" .003" .003" .003" .003" .003" .003" .003"

Ignition
Spark Plug - Type and Gap Type (See note 2) RCJ-8 RCJ-8 RCJ-8 RH-10 RH-10 RH-10 RH-10 RH-10

Battery .035" .035" .035" .035" .035" .035" .035" .035"

Magneto .025" .025" .025" .025" .025" .025" .025" .025"

LP/Propane .018" .018" .018" .018" .018" .018" .018" .018"

Nominal Point Gap or Mark on Flywheel / Degrees BTDC .020" or
S mark / 20º .020" or
S mark / 20º .020" or
S mark / 20º .020" or
S mark / 20º .020" or
S mark / 20º .020" or
S mark / 20º .020" or
S mark / 20º .020" or
S mark / 20º

Model (Horsepower @ 3,600 rpm) K90/K91
(4hp @ 4,000 rpm) K141 (6¼hp)
K160 (6.6hp)
K161 (7hp) K181 (8hp) K241 (10hp) K301 (12hp) K321 (14hp) K341 (16hp) K361 (18hp)
(Over Head Valve)

All Pistons
Service Replacement Sizes ß .003" - .010" - .020" - .030" à

(K-series piston)
Thrust Face O.D. (See note 3) New 2.371"/2.369" 2.866" (6¼hp)
2.9297"/2.9281" (7hp) 2.9297"/2.9281" 3.2432"/3.2413" 3.368"/3.365" 3.4941"/3.4925" 3.7425"/3.7410" 3.7425"/3.7410"

Maximum Wear Limits 2.366" 2.925" 2.925" 3.238" 3.363" 3.491" 3.738" 3.738"

Thrust Face to Bore Clearance (max.) (1) .0035"/.006" .007"/.010" .007"/.010" .007"/.010" .007"/.010" .007"/.010" .007"/.010" .007"/.010"

Ring End Gap (All 3 rings.) New Bore (See note 10) .007"/.017" .007"/.017" .007"/.017" .010"/.020" .010"/.020" .010"/.020" .010"/.020" .010"/.020"

Used Bore (Maximum) (See note 6) .027" .027" .027" .030" .030" .030" .030" .030"

Maximum Ring Side Clearance .006" .006" .006" .006" .006" .006" .006" .006"

(K-series piston)
Thrust Face O.D. (See note 5) New - - - - - - 3.7465"/3.7455" 3.7465"/3.7455"

Maximum Wear Limits - - - - - - 3.744 3.744

Thrust Face to Bore Clearance (max.) (See note 1) - - - - - - .0030"/.0050" .0030"/.0050"

Ring End Gap (All 3 rings.) New Bore (See note 10) - - - - - - .010"/.020" .010"/.020"

Used Bore (Maximum) (See note 6) - - - - - - .030" .030"

Maximum Ring Side Clearance - - - - - - .004" .004"

(Mahle piston)
Thrust Face O.D. (See notes 5, 9) New / Used - - 2.9329" (min.)
2.9336" (max.) - 3.3700" (min.)
3.3693" (max.) 3.4945" (min.) 3.4938" (max.) 3.7433"/3.7426" 3.7433"/3.7426"

Maximum Wear Limits - - 2.931" - 3.367" 3.492" 3.7406" 3.7406"

Thrust Face to Bore Clearance (See notes 1, 9) - - .0034" (min.)
.0051" (max.) - .0045" (min.)
.0062" (max.) .0050" (min.)
.0067" (max.) .0062" (min.)
.0079" (max.) .0062" (min.)
.0079" (max.)

Ring End Gap (All 3 rings.) New Bore (See note 10) - - .010"/.023" - .010"/.020" .010"/.020" .013"/.025" .013"/.025"

Used Bore (Maximum) (See note 6) - - .032" - .030" .030" .033" .033"

Maximum Ring Side Clearance - - .006" - .006" .006" .004" .004"

Wrist Pin Outside Diameter (min.-max.) .5623" - .5625" .6247" - .6249" .6247" - .6249" .8591" - .8593" .8752" - .8754" .8752" - .8754" .8752" - .8754" .8752" - .8754"

Model (Horsepower @ 3,600 rpm) K90/K91
(4hp @ 4,000 rpm) K141 (6¼hp)
K160 (6.6hp)
K161 (7hp) K181 (8hp) K241 (10hp) K301 (12hp) K321 (14hp) K341 (16hp) K361 (18hp)
(Over Head Valve)

Valves
Valve Head Diameter Intake: 15/16"
Exhaust: ? Intake: 1-3/8"
Exhaust: 1-1/8" Intake: 1-3/8"
Exhaust: 1-1/8" Intake: 1-3/8"
Exhaust: 1-1/8" Intake: 1-3/8"
Exhaust: 1-1/8" Intake: 1-3/8"
Exhaust: 1-1/8" (early) / 1-3/8" (late) Intake: 1-3/8"
Exhaust: 1-3/8" Intake: 1.438"
Exhaust: 1.400"

Guide Reamer Size .250" .3125" .3125" .3125" .3125" .3125" .3125" .3125"

Tappet Clearance (Cold) (See notes 4, 9) Intake
(min.-max.) .005"- .009" .006" - .008" .006" - .008" .008" - .010" .008" - .010" .008" - .010" .008" - .010" .005" - .008"

Exhaust
(min.-max.) .011" - .015" .017" - .019" .017" - .019" .017" - .019" .017" - .019" .017" - .019" .017" - .019" .010" - .012"

Minimum Lift (Zero Lash) Intake .2035" .2718" .2718" .318" .318" .318" .318" .318"

Exhaust .1768" .2482" .2482" .318" .318" .318" .318" .318"

Minimum Stem O.D. Intake .2478" .3103" .3103" .3103" .3103" .3103" .3103" .3103"

Exhaust .2458" .3088" .3088" .3074" .3074" .3074" .3074" .3074"

Face / Seat Angle 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º

Guide I.D. Maximum Wear Limit (See note 1) Intake .005" .005" .005" .006" .006" .006" .006" .006"

Exhaust .007" .007" .007" .008" .008" .008" .008" .008"

Lifter to Bore Clearance .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015"

NOTES

Note 1 - Subtract O.D. of inner part from I.D. of outer part. The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm operation.
Note 2 - Champion spark plugs or equivalent.
Note 3 - Measure just below oil ring groove and at right angles to wrist pin.
Note 4 - 1,800 RPM generator sets at .005"/ 007".
Note 5 - Measure 1/2" above the bottom of the piston skirt. Note 6 - Top and center compression rings.
Note 7 - Measure just below oil ring groove and at right angles to wrist pin.
Note 8 - Compression ratio depends on which cylinder head is used.
Note 9 - The lesser clearance is for a valve that have been ran for a while, and the greater clearance is for a fresh valve job. (As the valve and seat wear into each other, the clearance will be lessened.)
Note 10 - The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm or wide open throttle operation.

Single Cylinder Kohler Magnum Engine Specifications and Tolerances Top of Page
All dimensions in inches.

Model (Horsepower @ 3,600 rpm) M8 (8hp) M10 (10hp) M12 (12hp) M14 (14hp) M16 (16hp)

General Information
Bore x Stroke STD. 2.938"
.010" 2.948"
.020" 2.958"
.030" 2.968"
x 2.750" STD. 3.251"
.010" 3.261"
.020" 3.271"
.030" 3.281"
x 2.875" STD. 3.375"
.010" 3.385"
.020" 3.395"
.030" 3.405"
x 3.250" STD. 3.500"
.010" 3.510"
.020" 3.520"
.030" 3.530"
x 3.250" STD. 3.750"
.010" 3.760"
.020" 3.770"
.030" 3.780"
x 3.250"

Cubic Inch Displacement 18.64 23.85 29.07 31.27 35.90

Operating RPM (maximum) 3,600 3,600 3,600 3,600 3,600

Balance Gear
Shaft O.D.
New
- .4998"/.5001" .4998"/.5001" .4998"/.5001" .4998"/.5001"

Maximum Wear Limit - .4996" .4996" .4996" .4996"

End Play - .002"/.010" .002"/.010" .002"/.010" .002"/.010"

Camshaft End Play (See note 6) .005"/.010" .005"/.010" .005"/.010" .005"/.010" .005"/.010"

Connecting
Rod
Running Clearance Maximum Big End Diameter STD. 1.1875"
.010" 1.1775" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715" STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"

Rod to Crankpin (max.) .001"/.002" .001"/.002" .001"/.002" .001"/.002" .001"/.002"

Rod to Crankpin - Maximum Wear Limit .0025" .0025" .0025" .0025" .0025"

Rod to Wrist Pin (max.) .0006"/.0011" .0003"/.0008" .0003"/.0008" .0003"/.0008" .0003"/.0008"

Rod to Journal Side Clearance
(min.-max.)
.010" - .025" .010" - .025" .010" - .025" .010" - .025" .010" - .025"

Small End I.D. (max.) .6255"/.6258" .8596"/.8599" .8757"/.8760" .8757"/.8760" .8757"/.8760"

Crankshaft
Main PTO & Flywheel End O.D. New 1.1811"/1.1814" 1.5745"/1.5749" 1.5745"/1.5749" 1.5745"/1.5749" 1.5745"/1.5749"

Maximum Wear Limit 1.1811" 1.5745" 1.5745" 1.5745" 1.5745"

Crankpin New - O.D. STD. 1.186"/1.1855"
.010" 1.176"/1.1755" STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700" STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700" STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700" STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700"

Maximum Wear Limit STD. 1.1850"
.010" 1.1840" STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690" STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690 STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690 STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690

Maximum Out of Round .0005" .0005" .0005" .0005" .0005"

Maximum Taper .001" .001" .001" .001" .001"

End Play (See note 6) .002"/.023" .003"/.020" .003"/.020" .003"/.020" .003"/.020"

Cylinder Bore
Inside Diameter New (See note 6) 2.9370"/2.9380" 3.2505"/3.2515" 3.3745"/3.3755" 3.4995"/3.5005" 3.7495"/3.7505"

Maximum Wear Limit 2.941" 3.254" 3.378" 3.503" 3.753"

Maximum Out of Round (I.D.) .005" .005" .005" .005" .005"

Maximum Taper (I.D.) .003" .002" .002" .002" .002"

Cylinder Head Maximum Out of Flatness .003" .003" .003" .003" .003"

Ignition
(Solid State)
Spark Plug Type (See note 2) RCJ-8 RH-10 RH-10 RH-10 RH-10

Gap .025" .025" .025" .025" .025"

Module Air Gap .012"/.016" .012"/.016" .012"/.016" .012"/.016" .012"/.016"

Model (Horsepower)
M8 (8hp) M10 (10hp) M12 (12hp) M14 (16hp) M16 (16hp)

All Pistons Service Replacement Sizes
ß .003" - .010" - .020" - .030" à

(K-series piston)
Thrust Face O.D. (See note 3) New (See note 6) 2.9297"/2.9281 3.2432"/3.2413 3.368"/3.365 3.4941"/3.4925 -

Maximum Wear Limits 2.925" 3.238" 3.363" 3.491" -

Thrust Face to Bore Clearance (max.) (See notes 1, 6) .007"/.010" .007"/.010" .007"/.010" .007"/.010" -

Ring End Gap (All 3 rings.) New Bore (See note 7) .007"/.017" .010"/020" .010"/.020" .010"/.020" -

Used Bore (Maximum)
(See note 5) .027" .030" .030" .030" -

Maximum Ring Side Clearance .006" .006" .006" .006" -

(K-series and
Mahle piston)
Thrust Face O.D. (See note 4) New - - - - 3.7465"/3.7455"

Maximum Wear Limits - - - - 3.7435"

Thrust Face to Bore Clearance (max.) (See note 1) - - - - .003"/.005"

Ring End Gap (All 3 rings.) New Bore (See note 7) - - - - .010"/020"

Used Bore (Maximum) (See note 5) - - - - .030"

Maximum Ring Side Clearance - - - - .004"

(Mahle piston)
Thrust Face O.D. (See note 4) New (See note 6) 2.9329"/2.9336" - 3.3700"/3.3693" 3.4945"/3.4938" 3.7433"/3.7426"

Maximum Wear Limits 2.9312" - 3.3673" 3.4918" 3.7406"

Thrust Face to Bore Clearance (max.) (See note 1, 6) .0034"/.0051" - .0045"/.0062" .0050"/0067" .0062"/.0079"

Ring End Gap (All 3 rings.) New Bore
(See note 7) .010"/.023" - .010"/.020" .010"/.020" .013"/.025"

Used Bore
(See note 5) .032" (max.) - .030" (max.) .030" (max.) .033" (max.)

Maximum Ring Side Clearance .006" - .006" .006" .004"

Wrist Pin Outside Diameter .6247" (min.)
.6249" (max.) .8591" (min.)
.8593" (max.) .8752" (min.) .8754" (max.) .8752" (min.) .8754" (max.) .8752" (min.) .8754" (max.)

Valves
Valve Head Diameter Intake: 1-3/8"
Exhaust: 1-1/8" Intake: 1-3/8"
Exhaust: 1-1/8" Intake: 1-3/8"
Exhaust: 1-1/8" Intake: 1-3/8"
Exhaust: 1-3/8" Intake: 1-3/8"
Exhaust: 1-3/8"

Guide Reamer Size .3125" .3125" .3125" .3125" .3125"

Tappet Clearance (Cold) (see note 6) Intake
(min.-max.) .006" - .008" .008" - .010" .008" - .010" .008" - .010" .008" - .010"

Exhaust
(min.-max.) .017" - .019" .017" - .019" .017" - .019" .017" - .019" .017" - .019"

Minimum Lift
(Zero Lash) Intake .2718" .318" .318" .318" .318"

Exhaust .2482" .318" .318" .318" .318"

Minimum Stem O.D. Intake .3103" .3103" .3103" .3103" .3103"

Exhaust .3074" .3074" .3074" .3074" .3074"

Face Angle -
Seat Angle - 45º
46º 45º
46º 45º
46º 45º
46º 45º
46º

Guide I.D. Maximum Wear Limit
(See note 1) Intake .006" .006" .006" .006" .006"

Exhaust .008" .008" .008" .008" .008"

Lifter to Bore Clearance .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015"

NOTES:

Note 1 - Subtract O.D. of inner part from I.D. of outer part. The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm operation.
Note 2 - Champion spark plugs or equivalent.
Note 3 - Measure just below oil ring and at right angles to wrist pin.
Note 4 - Measure 1/2" above the bottom of the piston skirt. Note 5 - Top and center compression rings.
Note 6- The lesser clearance is for a valve that have been ran for a while, and the greater clearance is for a fresh valve job. (As the valve and seat wear into each other, the clearance will be lessened.)
Note 7 - The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm or wide open throttle operation.

Kohler K-Series and Magnum Single Cylinder Torque Values and Sequences for Fasteners | Top of page

Model (Horsepower)		K90/91 (4hp)	K141 (6¼hp), K161 (7hp)	K181/M8 (8hp)	K241/M10 (10hp), K301/M12 (12hp), K321/M14 (14hp), K341/M16 (16hp) and K361 (18hp OHV)
Connecting Rod Nuts/Bolts (See notes 1, 2, 3 & 4)	Posi-Lock (Flange Nut/Stud)	-	-	New 140 in. lb./12 ft. lb. Used 100 in. lb./9 ft. lb.	New 260 in. lb./22 ft. lb. Used 200 in. lb./17 ft. lb.
	Capscrew (Bolt)	140 in. lb./12 ft. lb.	200 in. lb./17 ft. lb.		285 in. lb./24 ft. lb.
Spark Plug		234 in. lb./20 ft. lb.	234 in. lb./20 ft. lb.		234 in. lb./20 ft. lb
Cylinder Head Torque Sequences and Torque Values (See note 1)		K90/K91 (4hp)	K141, K160/K161, K181/M8		K241/M10, K301/M12, K321/M14	K341/M16	K361
Flywheel Retaining (See note 6)	Nut (See note 1, 6)	45 ft. lb.	80 ft. lb. (See note 4)		65 ft. lb. (5/8" or 3/4" stud)
	3/8" Bolt (See note 1, 6)	250 in. lb.	-		24-35 ft. lb.
Governor Bushing		80 in. lb.	140 in. lb.		110 in. lb.
Grass Screen	Metal	-	70 - 140 in. lb.		70 - 140 in. lb.
	Plastic	-	-		20-30 in. lb.
Oil Pan	Cast Iron or Aluminum (See note 1)	250 in. lb.	Grade 5 - 250 in. lb. Grade 8 - 350 in. lb.		35 ft. lb.
	Sheet Metal (See note 1)	-	-		200 in. lb.
Plastic Fuel Pump Mounting Screws		-	40 in. lb.		40 in. lb.

Note 1 - Lubricate fastener threads with engine oil.
Note 2 - DO NOT overtorque - DO NOT loosen and retorque the hex nuts on Posi-Lock connecting rods.
Note 3 - Overtorque 20%, loosen below torque value and retorque to final torque value. NOTE: Overtorquing rod bolts 20% places stress on the threads in a NEW aluminum rod. This allows for proper tightness so bolts won't loosen later. Used rods: Torque to 285 in. lbs. one time only. NEW - Component directly from stock. USED - Component that was in a running engine.
Note 4 - To prevent rod bolts from loosening, install a split lock washer on each bolt and then torque them to specs. Posi-Lock (flange) nuts don't require a lock washer.
Note 5 - Prior to Serial No. 23209832 - 45-55 ft. lb.
Note 6 - Flywheel and crankshaft tapers must be clean and dry.

Identification & Torque Settings of Most Commonly Used Grades of Bolts Top of Page
Use Standard Torque Settings When Specific Values Are Not Specified.
(C) = Coarse thread, (F) = Fine thread

Hardness è

No lines = Grade 3

No lines = Grade 3 bolt

3 lines = Grade 5

3 lines = Grade 5 bolt

6 lines = Grade 8

6 lines = Grade 8 bolt

Stainless Steel /
Special Alloy
Stainless Steel / Special Alloy bolts

Bolt Size

Material: Low Carbon Steel. Tensile Strength: 85,000 p.s.i. (Low Strength)

Material: Medium Carbon Steel, Tempered. Tensile Strength: 120,000 p.s.i. (Medium Strength)

Material: Medium Carbon Alloy Steel, Quenched and Tempered. Tensile Strength: 150,000 p.s.i. (High Strength)

18-8 [304] Stainless Steel

 1/4-20 (C)
 1/4-28 (F)
5/16-18 (C)
5/16-24 (F)
 3/8-16 (C)
 3/8-24 (F)
7/16-14 (C)
7/16-20 (F)
 1/2-13 (C)
 1/2-20 (F)
9/16-12 (C)
9/16-18 (F)
 5/8-11 (C)
 5/8-18 (F)
 3/4-10 (C)
 3/4-16 (F)

 70 in. lb. /  6 ft. lb.
 85 in. lb. /  7 ft. lb.
150 in. lb. / 13 ft. lb.
165 in. lb. / 14 ft. lb.
260 in. lb. / 22 ft. lb.
300 in. lb. / 25 ft. lb.
 35 ft. lb.
 45 ft. lb.
 50 ft. lb.
 70 ft. lb.
 75 ft. lb.
100 ft. lb.
110 ft. lb.
140 ft. lb.
150 ft. lb.
200 ft. lb.

115 in. lb. / 10 ft. lb.
140 in. lb. / 12 ft. lb.
250 in. lb. / 21 ft. lb.
270 in. lb. / 23 ft. lb.
 35 ft. lb.
 40 ft. lb.
 55 ft. lb.
 75 ft. lb.
 80 ft. lb.
105 ft. lb.
125 ft. lb.
165 ft. lb.
180 ft. lb.
230 ft. lb.
245 ft. lb.
325 ft. lb.

165 in. lb. / 14 ft. lb.
200 in. lb. / 17 ft. lb.
350 in. lb. / 29 ft. lb.
 30 ft. lb.
 50 ft. lb.
 60 ft. lb.
 80 ft. lb.
105 ft. lb.
115 ft. lb.
165 ft. lb.
175 ft. lb.
230 ft. lb.
260 ft. lb.
330 ft. lb.
350 ft. lb.
470 ft. lb.

 14 ft. lb.
 17 ft. lb.
 29 ft. lb.
 35 ft. lb.
 58 ft. lb.
 69 ft. lb.
 98 ft. lb.
110 ft. lb.
145 ft. lb.
160 ft. lb.
200 ft. lb.
220 ft. lb.
280 ft. lb.
310 ft. lb.
490 ft. lb.
530 ft. lb.

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Model (Horsepower @ 3,600 rpm)				K90/K91 (4hp @ 4,000 rpm)	K141 (6¼hp) K160 (6.6hp) K161 (7hp)	K181 (8hp)	K241 (10hp)	K301 (12hp)	K321 (14hp)	K341 (16hp)	K361 (18hp) (Over Head Valve)
General Information	Bore x Stroke			STD. 2.375" .010" 2.385" .020" 2.395" .030" 2.405" x 2.000"	6¼ & 6.6hp - STD. 2.875" 7hp - STD. 2.938" .010" 2.948" .020" 2.958" .030" 2.968" x 2.500"	STD. 2.938" .010" 2.948" .020" 2.958" .030" 2.968" x 2.750"	STD. 3.251" .010" 3.261" .020" 3.271" .030" 3.281" x 2.875"	STD. 3.375" .010" 3.385" .020" 3.395" .030" 3.405" x 3.250"	STD. 3.500" .010" 3.510" .020" 3.520" .030" 3.530" x 3.250"	STD. 3.750" .010" 3.760" .020" 3.770" .030" 3.780" x 3.250"	STD. 3.750" .010" 3.760" .020" 3.770" .030" 3.780" x 3.250"
	Cubic Inch Displacement			8.86	16.23 (6¼hp) 16.95 (7hp)	18.64	23.85	29.07	31.27	35.90	35.90
	Compression Ratio			?	5.93:1 (6¼hp) 6.2:1 (7hp)	6.8:1	5:1, 5.4:1 or 7.1:1 (See note 8)	6.1:1, 6.6:1 or 8.6:1 (See note 8)	6.6:1, 7:1 or 9:1 (See note 8)	7.4:1	9.2:1
	Operating RPM (maximum)			4,000	3,600	3,600	3,600	3,600	3,600	3,600	3,600
Balance Gear	Shaft O.D.	New		-	-	-	.4998" (min.) .5001" (max.)	.4998" (min.) .5001" (max.)	.4998" (min.) .5001" (max.)	.4998" (min.) .5001" (max.)	.4998" (min.) .5001" (max.)
	Shaft O.D.	Wear Limit (maximum)		-	-	-	.4996"	.4996"	.4996"	.4996"	.4996"
	End Play			-	-	-	.002" (min.) .010" (max.)	.002" (min.) .010" (maz.)	.002" (min.) .010" (max.)	.002" (min.) .010" (max.)	.002" (min.) .010" (max.)
Camshaft	End Play (See note 9)			.005" (min.) .020" (max.)	.005" (min.) .010" (max.)	.005" (min.) .010" (max.)	.005" (min.) .010" (max.)	.005" (min.) .010" (max.)	.005" (min.) .010" (max.)	.005" (min.) .010" (max.)	.005" (min.) .010" (max.)
Connecting Rod	Running Clearance (See note 9)		Big End Diameter (maximum)	STD. .938" .010" .928	STD. 1.1875" .010" 1.1775"	STD. 1.1875" .010" 1.1775"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"
			Rod to Crankpin	.001" (min.) .0025" (max.)	.001" (min.) .002" (max.)	.001" (min.) .002" (max.)	.001" (min.) .002" (max.)	.001" (min.) .002" (max.)	.001" (min.) .002" (max.)	.001" (min.) .002" (max.)	.001" (min.) .002" (max.)
			Rod to Crankpin Wear Limit (maximum)	.003"	.0025"	.0025"	.0025"	.0025"	.0025"	.0025"	.0025"
			Rod to Piston Pin	.0007" (min.) .0008" (max.)	.0006" (min.) .0011" (max.)	.0006" (min.) .0011" (max.)	.0003" (min.) .0008" (max.)	.0003" (min.) .0008" (max.)	.0003" (min.) .0008" (max.)	.0003" (min.) .0008" (max.)	.0003" (min.) .0008" (max.)
	Rod to Journal Side Clearance			.010" (min.) .025" (max.)	.010" (min.) .025" (max.)	.010" (min.) .025" (max.)	.010" (min.) .025" (max.)	.010" (min.) .025" (max.)	.010" (min.) .025" (max.)	.010" (min.) .025" (max.)	.010" (min.) .025" (max.)
	Wrist Pin Hole (Small End) I.D.			.5630" (min.) .5633" (max.)	.6255" (min.) .6258" (max.)	.6255" (min.) .6258" (max.)	.8596" (min.) .8599" (max.)	.8757" (min.) .8760" (max.)	.8757" (min.) .8760" (max.)	.8757" (min.) .8760" (max.)	.8757" (min.) .8760" (max.)
Crankshaft	Main PTO and Flywheel End O.D.		New (max.)	.9844"	1.1814"	1.1814"	1.5749"	1.5749"	1.5749"	1.5749"	1.5749"
	Main PTO and Flywheel End O.D.		Wear Limit (maximum)	.9841"	1.1811"	1.1811"	1.5745"	1.5745"	1.5745"	1.5745"	1.5745"
	Crankpin	New (max./min.) (See note 9)		STD. - .9360"/.9355" .010" - .9260"/.9255"	STD - 1.1860"/1.1855" .010" - 1.1760"/1.1755"	STD - 1.186"/1.1855" .010" - 1.176"/1.1755"	STD - 1.4995"/1.5000" .010" - 1.4895"/1.4900" .020" - 1.4795"/1.4800" .030" - 1.4695"/1.4700"	STD - 1.4995"/1.5000" .010" - 1.4895"/1.4900" .020" - 1.4795"/1.4800" .030" - 1.4695"/1.4700"	STD - 1.4995"/1.5000" .010" - 1.4895"/1.4900" .020" - 1.4795"/1.4800" .030" - 1.4695"/1.4700"	STD - 1.4995"/1.5000" .010" - 1.4895"/1.4900" .020" - 1.4795"/1.4800" .030" - 1.4695"/1.4700"	STD - 1.4995"/1.5000" .010" - 1.4895"/1.4900" .020" - 1.4795"/1.4800" .030" - 1.4695"/1.4700"
		Wear Limit (maximum)		STD. .9350" .010" .9340"	STD. 1.1850" .010" 1.1840"	STD. 1.1850" .010" 1.1840"	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690"	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690"	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690"	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690"	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690"
		Out of Round (maximum)		.0005"	.0005"	.0005"	.0005"	.0005"	.0005"	.0005"	.0005"
		Taper (max.)		.001"	.001"	.001"	.001"	.001"	.001"	.001"	.001"
	End Play (See note 9)			.004" (min.) .023" (max.)	.002" (min.) .023" (max.)	.002" (min.) .023" (max.)	.003" (min.) .020" (max.)	.003" (min.) .020" (max.)	.003" (min.) .020" (max.)	.003" (min.) .020" (max.)	.003" (min.) .020" (max.)
Cylinder Bore	Standard Size Cylinder Bore Diameter		New (See note 9)	2.3745" - 2.3755" (max.)	2.9370" - 2.9380" (max.)	2.9370" - 2.9380" (max.)	3.2505" - 3.2515" (max.)	3.3745" - 3.3755" (max.)	3.4995" - 3.5005" (max.)	3.7495" - 3.7505" (max.)	3.7495" - 3.7505" (max.)
	Standard Size Cylinder Bore Diameter		Maximum Wear Limit	2.378"	2.941"	2.941"	3.254"	3.378"	3.503"	3.753"	3.753"
	Cylinder Bore Diameter for Oversize Piston/Rings			.010" = 2.385" .020" = 2.285" .030" = 2.405"	.010" = 2.9475" .020" = 2.9575" .030" = 2.9675"	.010" = 2.9475" .020" = 2.9575" .030" = 2.9675"	.010" = 3.260" .020" = 3.270" .030" = 3.280"	.010" = 3.385" .020" = 3.395" .030" = 3.405"	.010" = 3.510" .020" = 3.520" .030" = 3.530"	.010" = 3.760" .020" = 3.770" .030" = 3.780"	.010" = 3.760" .020" = 3.770" .030" = 3.780"
	Maximum Out of Round			.003"	.003"	.003"	.003"	.003"	.003"	.003"	.003"
	Maximum Taper			.003"	.003"	.003"	.002"	.002"	.002"	.002"	.002"
Cylinder Head	Maximum Out of Flatness			.003"	.003"	.003"	.003"	.003"	.003"	.003"	.003"
Ignition	Spark Plug - Type and Gap		Type (See note 2)	RCJ-8	RCJ-8	RCJ-8	RH-10	RH-10	RH-10	RH-10	RH-10
			Battery	.035"	.035"	.035"	.035"	.035"	.035"	.035"	.035"
			Magneto	.025"	.025"	.025"	.025"	.025"	.025"	.025"	.025"
			LP/Propane	.018"	.018"	.018"	.018"	.018"	.018"	.018"	.018"
	Nominal Point Gap or Mark on Flywheel / Degrees BTDC			.020" or S mark / 20º	.020" or S mark / 20º	.020" or S mark / 20º	.020" or S mark / 20º	.020" or S mark / 20º	.020" or S mark / 20º	.020" or S mark / 20º	.020" or S mark / 20º
Model (Horsepower @ 3,600 rpm)				K90/K91 (4hp @ 4,000 rpm)	K141 (6¼hp) K160 (6.6hp) K161 (7hp)	K181 (8hp)	K241 (10hp)	K301 (12hp)	K321 (14hp)	K341 (16hp)	K361 (18hp) (Over Head Valve)
All Pistons	Service Replacement Sizes			ß .003" - .010" - .020" - .030" à
(K-series piston)	Thrust Face O.D. (See note 3)		New	2.371"/2.369"	2.866" (6¼hp) 2.9297"/2.9281" (7hp)	2.9297"/2.9281"	3.2432"/3.2413"	3.368"/3.365"	3.4941"/3.4925"	3.7425"/3.7410"	3.7425"/3.7410"
	Thrust Face O.D. (See note 3)		Maximum Wear Limits	2.366"	2.925"	2.925"	3.238"	3.363"	3.491"	3.738"	3.738"
	Thrust Face to Bore Clearance (max.) (1)			.0035"/.006"	.007"/.010"	.007"/.010"	.007"/.010"	.007"/.010"	.007"/.010"	.007"/.010"	.007"/.010"
	Ring End Gap (All 3 rings.)		New Bore (See note 10)	.007"/.017"	.007"/.017"	.007"/.017"	.010"/.020"	.010"/.020"	.010"/.020"	.010"/.020"	.010"/.020"
	Ring End Gap (All 3 rings.)		Used Bore (Maximum) (See note 6)	.027"	.027"	.027"	.030"	.030"	.030"	.030"	.030"
	Maximum Ring Side Clearance			.006"	.006"	.006"	.006"	.006"	.006"	.006"	.006"
(K-series piston)	Thrust Face O.D. (See note 5)		New	-	-	-	-	-	-	3.7465"/3.7455"	3.7465"/3.7455"
	Thrust Face O.D. (See note 5)		Maximum Wear Limits	-	-	-	-	-	-	3.744	3.744
	Thrust Face to Bore Clearance (max.) (See note 1)			-	-	-	-	-	-	.0030"/.0050"	.0030"/.0050"
	Ring End Gap (All 3 rings.)		New Bore (See note 10)	-	-	-	-	-	-	.010"/.020"	.010"/.020"
	Ring End Gap (All 3 rings.)		Used Bore (Maximum) (See note 6)	-	-	-	-	-	-	.030"	.030"
	Maximum Ring Side Clearance			-	-	-	-	-	-	.004"	.004"
(Mahle piston)	Thrust Face O.D. (See notes 5, 9)		New / Used	-	-	2.9329" (min.) 2.9336" (max.)	-	3.3700" (min.) 3.3693" (max.)	3.4945" (min.) 3.4938" (max.)	3.7433"/3.7426"	3.7433"/3.7426"
	Thrust Face O.D. (See notes 5, 9)		Maximum Wear Limits	-	-	2.931"	-	3.367"	3.492"	3.7406"	3.7406"
	Thrust Face to Bore Clearance (See notes 1, 9)			-	-	.0034" (min.) .0051" (max.)	-	.0045" (min.) .0062" (max.)	.0050" (min.) .0067" (max.)	.0062" (min.) .0079" (max.)	.0062" (min.) .0079" (max.)
	Ring End Gap (All 3 rings.)		New Bore (See note 10)	-	-	.010"/.023"	-	.010"/.020"	.010"/.020"	.013"/.025"	.013"/.025"
	Ring End Gap (All 3 rings.)		Used Bore (Maximum) (See note 6)	-	-	.032"	-	.030"	.030"	.033"	.033"
	Maximum Ring Side Clearance			-	-	.006"	-	.006"	.006"	.004"	.004"
	Wrist Pin Outside Diameter (min.-max.)			.5623" - .5625"	.6247" - .6249"	.6247" - .6249"	.8591" - .8593"	.8752" - .8754"	.8752" - .8754"	.8752" - .8754"	.8752" - .8754"
Model (Horsepower @ 3,600 rpm)				K90/K91 (4hp @ 4,000 rpm)	K141 (6¼hp) K160 (6.6hp) K161 (7hp)	K181 (8hp)	K241 (10hp)	K301 (12hp)	K321 (14hp)	K341 (16hp)	K361 (18hp) (Over Head Valve)
Valves	Valve Head Diameter			Intake: 15/16" Exhaust: ?	Intake: 1-3/8" Exhaust: 1-1/8"	Intake: 1-3/8" Exhaust: 1-1/8"	Intake: 1-3/8" Exhaust: 1-1/8"	Intake: 1-3/8" Exhaust: 1-1/8"	Intake: 1-3/8" Exhaust: 1-1/8" (early) / 1-3/8" (late)	Intake: 1-3/8" Exhaust: 1-3/8"	Intake: 1.438" Exhaust: 1.400"
	Guide Reamer Size			.250"	.3125"	.3125"	.3125"	.3125"	.3125"	.3125"	.3125"
	Tappet Clearance (Cold) (See notes 4, 9)		Intake (min.-max.)	.005"- .009"	.006" - .008"	.006" - .008"	.008" - .010"	.008" - .010"	.008" - .010"	.008" - .010"	.005" - .008"
	Tappet Clearance (Cold) (See notes 4, 9)		Exhaust (min.-max.)	.011" - .015"	.017" - .019"	.017" - .019"	.017" - .019"	.017" - .019"	.017" - .019"	.017" - .019"	.010" - .012"
	Minimum Lift (Zero Lash)		Intake	.2035"	.2718"	.2718"	.318"	.318"	.318"	.318"	.318"
	Minimum Lift (Zero Lash)		Exhaust	.1768"	.2482"	.2482"	.318"	.318"	.318"	.318"	.318"
	Minimum Stem O.D.		Intake	.2478"	.3103"	.3103"	.3103"	.3103"	.3103"	.3103"	.3103"
	Minimum Stem O.D.		Exhaust	.2458"	.3088"	.3088"	.3074"	.3074"	.3074"	.3074"	.3074"
	Face / Seat Angle			45º / 46º	45º / 46º	45º / 46º	45º / 46º	45º / 46º	45º / 46º	45º / 46º	45º / 46º
	Guide I.D. Maximum Wear Limit (See note 1)		Intake	.005"	.005"	.005"	.006"	.006"	.006"	.006"	.006"
			Exhaust	.007"	.007"	.007"	.008"	.008"	.008"	.008"	.008"
			Lifter to Bore Clearance	.001" - .0015"	.001" - .0015"	.001" - .0015"	.001" - .0015"	.001" - .0015"	.001" - .0015"	.001" - .0015"	.001" - .0015"

Model (Horsepower @ 3,600 rpm)			M8 (8hp)	M10 (10hp)	M12 (12hp)	M14 (14hp)	M16 (16hp)
General Information	Bore x Stroke		STD. 2.938" .010" 2.948" .020" 2.958" .030" 2.968" x 2.750"	STD. 3.251" .010" 3.261" .020" 3.271" .030" 3.281" x 2.875"	STD. 3.375" .010" 3.385" .020" 3.395" .030" 3.405" x 3.250"	STD. 3.500" .010" 3.510" .020" 3.520" .030" 3.530" x 3.250"	STD. 3.750" .010" 3.760" .020" 3.770" .030" 3.780" x 3.250"
	Cubic Inch Displacement		18.64	23.85	29.07	31.27	35.90
	Operating RPM (maximum)		3,600	3,600	3,600	3,600	3,600
Balance Gear	Shaft O.D.	New	-	.4998"/.5001"	.4998"/.5001"	.4998"/.5001"	.4998"/.5001"
	Shaft O.D.	Maximum Wear Limit	-	.4996"	.4996"	.4996"	.4996"
	End Play		-	.002"/.010"	.002"/.010"	.002"/.010"	.002"/.010"
Camshaft	End Play (See note 6)		.005"/.010"	.005"/.010"	.005"/.010"	.005"/.010"	.005"/.010"
Connecting Rod	Running Clearance	Maximum Big End Diameter	STD. 1.1875" .010" 1.1775"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"	STD. 1.5015" .010" 1.4915" .020" 1.4815" .030" 1.4715"
		Rod to Crankpin (max.)	.001"/.002"	.001"/.002"	.001"/.002"	.001"/.002"	.001"/.002"
		Rod to Crankpin - Maximum Wear Limit	.0025"	.0025"	.0025"	.0025"	.0025"
		Rod to Wrist Pin (max.)	.0006"/.0011"	.0003"/.0008"	.0003"/.0008"	.0003"/.0008"	.0003"/.0008"
	Rod to Journal Side Clearance (min.-max.)		.010" - .025"	.010" - .025"	.010" - .025"	.010" - .025"	.010" - .025"
	Small End I.D. (max.)		.6255"/.6258"	.8596"/.8599"	.8757"/.8760"	.8757"/.8760"	.8757"/.8760"
Crankshaft	Main PTO & Flywheel End O.D.	New	1.1811"/1.1814"	1.5745"/1.5749"	1.5745"/1.5749"	1.5745"/1.5749"	1.5745"/1.5749"
	Main PTO & Flywheel End O.D.	Maximum Wear Limit	1.1811"	1.5745"	1.5745"	1.5745"	1.5745"
	Crankpin	New - O.D.	STD. 1.186"/1.1855" .010" 1.176"/1.1755"	STD. 1.4995"/1.5000" .010" 1.4895"/1.4900" .020" 1.4795"/1.4800" .030" 1.4695"/1.4700"	STD. 1.4995"/1.5000" .010" 1.4895"/1.4900" .020" 1.4795"/1.4800" .030" 1.4695"/1.4700"	STD. 1.4995"/1.5000" .010" 1.4895"/1.4900" .020" 1.4795"/1.4800" .030" 1.4695"/1.4700"	STD. 1.4995"/1.5000" .010" 1.4895"/1.4900" .020" 1.4795"/1.4800" .030" 1.4695"/1.4700"
		Maximum Wear Limit	STD. 1.1850" .010" 1.1840"	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690"	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690	STD. 1.4990" .010" 1.4890" .010" 1.4790" .010" 1.4690
		Maximum Out of Round	.0005"	.0005"	.0005"	.0005"	.0005"
		Maximum Taper	.001"	.001"	.001"	.001"	.001"
	End Play (See note 6)		.002"/.023"	.003"/.020"	.003"/.020"	.003"/.020"	.003"/.020"
Cylinder Bore	Inside Diameter	New (See note 6)	2.9370"/2.9380"	3.2505"/3.2515"	3.3745"/3.3755"	3.4995"/3.5005"	3.7495"/3.7505"
	Inside Diameter	Maximum Wear Limit	2.941"	3.254"	3.378"	3.503"	3.753"
	Maximum Out of Round (I.D.)		.005"	.005"	.005"	.005"	.005"
	Maximum Taper (I.D.)		.003"	.002"	.002"	.002"	.002"
Cylinder Head		Maximum Out of Flatness	.003"	.003"	.003"	.003"	.003"
Ignition (Solid State)	Spark Plug	Type (See note 2)	RCJ-8	RH-10	RH-10	RH-10	RH-10
	Spark Plug	Gap	.025"	.025"	.025"	.025"	.025"
	Module Air Gap		.012"/.016"	.012"/.016"	.012"/.016"	.012"/.016"	.012"/.016"
Model (Horsepower)			M8 (8hp)	M10 (10hp)	M12 (12hp)	M14 (16hp)	M16 (16hp)
All Pistons	Service Replacement Sizes		ß .003" - .010" - .020" - .030" à
(K-series piston)	Thrust Face O.D. (See note 3)	New (See note 6)	2.9297"/2.9281	3.2432"/3.2413	3.368"/3.365	3.4941"/3.4925	-
	Thrust Face O.D. (See note 3)	Maximum Wear Limits	2.925"	3.238"	3.363"	3.491"	-
	Thrust Face to Bore Clearance (max.) (See notes 1, 6)		.007"/.010"	.007"/.010"	.007"/.010"	.007"/.010"	-
	Ring End Gap (All 3 rings.)	New Bore (See note 7)	.007"/.017"	.010"/020"	.010"/.020"	.010"/.020"	-
	Ring End Gap (All 3 rings.)	Used Bore (Maximum) (See note 5)	.027"	.030"	.030"	.030"	-
	Maximum Ring Side Clearance		.006"	.006"	.006"	.006"	-
(K-series and Mahle piston)	Thrust Face O.D. (See note 4)	New	-	-	-	-	3.7465"/3.7455"
	Thrust Face O.D. (See note 4)	Maximum Wear Limits	-	-	-	-	3.7435"
	Thrust Face to Bore Clearance (max.) (See note 1)		-	-	-	-	.003"/.005"
	Ring End Gap (All 3 rings.)	New Bore (See note 7)	-	-	-	-	.010"/020"
	Ring End Gap (All 3 rings.)	Used Bore (Maximum) (See note 5)	-	-	-	-	.030"
	Maximum Ring Side Clearance		-	-	-	-	.004"
(Mahle piston)	Thrust Face O.D. (See note 4)	New (See note 6)	2.9329"/2.9336"	-	3.3700"/3.3693"	3.4945"/3.4938"	3.7433"/3.7426"
	Thrust Face O.D. (See note 4)	Maximum Wear Limits	2.9312"	-	3.3673"	3.4918"	3.7406"
	Thrust Face to Bore Clearance (max.) (See note 1, 6)		.0034"/.0051"	-	.0045"/.0062"	.0050"/0067"	.0062"/.0079"
	Ring End Gap (All 3 rings.)	New Bore (See note 7)	.010"/.023"	-	.010"/.020"	.010"/.020"	.013"/.025"
	Ring End Gap (All 3 rings.)	Used Bore (See note 5)	.032" (max.)	-	.030" (max.)	.030" (max.)	.033" (max.)
	Maximum Ring Side Clearance		.006"	-	.006"	.006"	.004"
Wrist Pin	Outside Diameter		.6247" (min.) .6249" (max.)	.8591" (min.) .8593" (max.)	.8752" (min.) .8754" (max.)	.8752" (min.) .8754" (max.)	.8752" (min.) .8754" (max.)
Valves	Valve Head Diameter		Intake: 1-3/8" Exhaust: 1-1/8"	Intake: 1-3/8" Exhaust: 1-1/8"	Intake: 1-3/8" Exhaust: 1-1/8"	Intake: 1-3/8" Exhaust: 1-3/8"	Intake: 1-3/8" Exhaust: 1-3/8"
	Guide Reamer Size		.3125"	.3125"	.3125"	.3125"	.3125"
	Tappet Clearance (Cold) (see note 6)	Intake (min.-max.)	.006" - .008"	.008" - .010"	.008" - .010"	.008" - .010"	.008" - .010"
	Tappet Clearance (Cold) (see note 6)	Exhaust (min.-max.)	.017" - .019"	.017" - .019"	.017" - .019"	.017" - .019"	.017" - .019"
	Minimum Lift (Zero Lash)	Intake	.2718"	.318"	.318"	.318"	.318"
	Minimum Lift (Zero Lash)	Exhaust	.2482"	.318"	.318"	.318"	.318"
	Minimum Stem O.D.	Intake	.3103"	.3103"	.3103"	.3103"	.3103"
	Minimum Stem O.D.	Exhaust	.3074"	.3074"	.3074"	.3074"	.3074"
	Face Angle - Seat Angle -		45º 46º	45º 46º	45º 46º	45º 46º	45º 46º
	Guide I.D. Maximum Wear Limit (See note 1)	Intake	.006"	.006"	.006"	.006"	.006"
		Exhaust	.008"	.008"	.008"	.008"	.008"
		Lifter to Bore Clearance	.001" - .0015"	.001" - .0015"	.001" - .0015"	.001" - .0015"	.001" - .0015"