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K-Series - Single Cylinder Engine Specifications & Tolerances

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All dimensions in inches.

Model (Horsepower) K91 (4) K161 (7) K181 (8) K241 (10) K301 (12) K321 (14) K341 (16)
General Bore x Stroke 2.375 x 2.000 2.938 x 2.500 2.938 x 2.750 3.251 x 2.875 3.375 x 3.250 3.500 x 3.250 3.750 x 3.250
Displacement Cu. In. 8.86 16.94 18.64 23.85 29.07 31.27 35.90
Max. Operating RPM 4000 3600 3600 3600 3600 3600 3600
Balance
Gear
Shaft O.D. New - - - .4998/.5001 .4998/.5001 .4998/.5001 .4998/.5001
Max Wear Limit - - - .4996 .4996 .4996 .4996
End Play - - - .002/.010 .002/.010 .002/.010 .002/.010
Camshaft End Play .005/.020 .005/.010 .005/.010 .005/.010 .005/.010 .005/.010 .005/.010
Connecting
Rod
Running
Clearance
Rod to Crankpin (New) .001/.0025 .001/.002 .001/.002 .001/.002 .001/.002 .001/.002 .001/.002
Rod to Crankpin Wear Limit .003 .0025 .0025 .0025 .0025 .0025 .0025
Rod to Piston Pin (New) .0007/.0008 .0006/.0011 .0006/.0011 .0003/.0008 .0003/.0008 .0003/.0008 .0003/.0008
Small End I.D. (New) .5630/.5633 .6255/.6258 .6255/.6258 .8596/.8599 .8757/.8760 .8757/.8760 .8757/.8760
Crankshaft Main PTO &
Flywheel
End O.D.
New .9841/.9844 1.1811/1.1814 1.1811/1.1814 1.5745/1.5749 1.5745/1.5749 1.5745/1.5749 1.5745/1.5749
Max. Wear Limit .9841 1.1811 1.1811 1.5745 1.5745 1.5745 1.5745

Crankpin

New .9360/.9355 1.1860/1.1855 1.1860/1.1855 1.5000/1.4995 1.5000/1.4995 1.5000/1.4995 1.5000/1.4995
Max. Wear Limit .9350 1.1850 1.1850 1.4990 1.4990 1.4990 1.4990
Max. Out of Round .0005 .0005 .0005 .0005 .0005 .0005 .0005
Max. Taper .001 .001 .001 .001 .001 .001 .001
End Play .004/.023 .002/.023 .002/.023 .003/.020 .003/.020 .003/.020 .003/.020
Cylinder Bore Inside Diameter New 2.3755/2.3745 2.9380/2.9370 2.9380/2.9370 3.2515/3.2505 3.3755/3.3745 3.5005/3.4995 3.7505/3.7495
Max. Wear Limit 2.378 2.941 2.941 3.254 3.378 3.503 3.753
Max. Out of Round .003 .003 .003 .003 .003 .003 .003
Max. Taper .003 .003 .003 .002 .002 .002 .002
Cylinder Head Max. Out of Flatness .003 .003 .003 .003 .003 .003 .003
Ignition Spark Plug Type & Gap Type2 RCJ-8 RCJ-8 RCJ-8 RH-10 RH-10 RH-10 RH-10
Battery .025 .025 .025 .035 .035 .035 .035
Magneto .025 .025 .025 .025 .025 .025 .025
Gaseous Fuels .018 .018 .018 .018 .018 .018 .018
Nominal Point Gap .020 .020 .020 .020 .020 .020 .020
Model (Horsepower) K91 (4) K161 (7) K181 (8) K241 (10) K301 (12) K321 (14) K341 (16)
All Pistons Service Replacement Sizes .003 - .010 - .020 - .030
Thrust Face O.D.3 New 2.371/2.369 2.9297/2.9281 2.9297/2.9281 3.2432/3.2413 3.368/3.365 3.4941/3.4925 3.7425/3.7410
Max. Wear Limits 2.366 2.925 2.925 3.238 3.363 3.491 3.738
Thrust Face to Bore Clearance (New)1 .0035/.006 .007/.010 .007/.010 .007/.010 .007/.010 .007/.010 .007/.010
Ring End Gap New Bore .007/.017 .007/.017 .007/.017 .010/.020 .010/.020 .010/.020 .010/.020
Used Bore (Max.) .027 .027 .027 .030 .030 .030 .030
Max. Ring side Clearance .006 .006 .006 .006 .006 .006 .006
Thrust Face
O.D.
5
New - - - - - - 3.7465/3.7455
Max. Wear Limits - - - - - - 3.744
Thrust Face to Bore Clearance (New)1 - - - - - - .0030/.0050
Ring End Gap New Bore6 - - - -     .010/.020
Used Bore (Max.)6 - - - - - - .030
Max. Ring Side Clearance - - - - - - .004
Thrust Face
O.D.
5
New - - 2.9329/2.9336 - 3.3700/3.3693 3.4945/3.4938 3.7433/3.7426
Max. Wear Limits - - 2.931 - 3.367 3.492 3.7406
Thrust Face to Bore Clearance (New)1 - - .0034/.0051 - .0045/.0062 .0050/.0067 .0062/.0079
Ring End Gap New Bore6 - - .010/.023 - .010/.020 .010/.020 .013/.025
Used Bore (Max.)6 - - .032 - .030 .030 .033
Max. Ring Side Clearance - - .006 - .006 .006 .004
Model (Horsepower) K91 (4) K161 (7) K181 (8) K241 (10) K301 (12) K321 (14) K341 (16)
Piston Pin Outside Diameter .5623/.5625 .6247/.6249 .6247/.6249 .8591/.8593 .8752/.8754 .8752/.8754 .8752/.8754
Valves Guide Reamer Size .250 .3125 .3125 .3125 .3125 .3125 .3125
Tappet
Clearance
(Cold)
Intake .005/.009 .006/.008 .006/.008 .008/.010 .008/.010 .008/.010 .008/.010 4
Exhaust .011/.015 .017/.019 .017/.019 .017/.019 .017/.019 .017/.019 .017/.019
Minimum Lift
(Zero Lash)
Intake .2035 .2718 .2718 .318 .318 .318 .318
Exhaust .1768 .2482 .2482 .318 .318 .318 .318
Minimum
Valve Stem
O.D.
Intake .2478 .3103 .3103 .3103 .3103 .3103 .3103
Exhaust .2458 .3088 .3088 .3074 .3074 .3074 .3074
Nominal Angle Valve seat 45o 45o 45o 45o 45o 45o 45o
Guide I.D.
Max. Wear
Limit1
Intake .005 .005 .005 .006 .006 .006 .006
Exhaust .007 .007 .007 .008 .008 .008 .008

1Subtract O.D. of inner part from I.D. of outer part.
2Champion spark plugs or equivalent
3Measure just below oil ring groove and at right angles to piston pin
41800 RPM generator sets .005/ 007.
5Measure 1/2" above the bottom of the piston skirt
6Top and center compression rings

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