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ENGINE SPECIFICATIONS
OVRM40 OVRM50-6.75 OVRM120 OHH50
Specifications OVRM105 OHSK50
Standard Metric Standard Metric Standard Metric Standard Metric
English mm English mm English mm English mm
Displacement (in
2
) (cc) 9.06 148.50 10.49 171.93 11.9 195.04 10.49 171.93
Note (A) Note (A) Note (A) Note (A)
Stroke 1.844 46.838 1.938 49.225 1.938 49.225 1.938 49.225
Bore 2.500 63.500 2.625 66.675 2.795 70.993 2.625 66.675
2.501 63.525 2.626 66.700 2.796 71.018 2.626 66.700
Note (B) Note (B) Note (B) Note (B)
Ignition Module Air Gap .0125 .3175 .0125 .3175 .0125 .3175 .0125 .3175
Spark Plug Gap .030 .762 .030 .762 .030 .762 .030 .762
Valve Clearance In./Ex. .004 .1016 .004 .1016 .004 .1016 .004 .1016
.004 .1016 .004 .1016 .004 .1016 .004 .1016
Valve Seat Angle 46
0
46
0
46
0
46
0
Valve Seat Width .035 .889 .035 .889 .035 .889 .035 .889
.045 1.143 .045 1.143 .045 1.143 .045 1.143
Valve Guide Oversize
INT. EX. INT. EX. INT. EX. INT. EX. INT. EX. INT. EX.
Dimension .2807 .2787 7.130 7.079 .2807 ..2787 7.130 .7.079 .2807 ..2787 7.130 .7.079 .2807 7.135
.2817 .2797 7.155 7.104 .2817 .2797 7.155 7.104 .2817 .2797 7.155 7.104 .2817 7.155
Crankshaft End Play .006 .1524 .006 .1524 .006 .1524 .006 .1524
.027 .6858 .027 .6858 .027 .6858 .027 .6858
Note (C) Note (C) Note (C) Note (C) Note (C) Note (C) Note (C) Note (C)
Crankpin Journal Dia. .8610 31.869 .9995 25.362 .9995 25.362 .9995 25.362
.8615 21.882 1.000 25.400 1.000 25.400 1.000 25.400
Crankshaft Dia. Flywheel .9985 25.362 .9985 25.362 .9985 25.362 .9985 25.362
End Main Brg. .9990 25.375 .9990 25.375 .9990 25.375 .9990 25.375
Crankshaft Dia. .9985 25.362 1.0005 25.413 1.0005 25.413 .9985 25.362
P.T.O. Main Brg. .9990 25.375 1.0010 25.425 1.0010 25.425 .9990 25.375
Conn. Rod Dia. Crank Brg. 1.0005 25.413 1.0005 25.413 1.0005 25.413 1.0005 25.413
1.0010 25.425 1.0010 25.425 1.0010 25.425 1.0010 25.425
Camshaft Bearing Diameter .4975 12.637 .4975 12.637 .4975 12.637 .4970 12.624
.4980 12.649 .4980 12.649 .4980 12.649 .4975 12.637
Piston Dia. Bottom of Skirt 2.4950 63.373 2.6204 66.558 2.6204 66.558 2.6204 66.558
2.4520 63.378 2.6220 66.599 2.6220 66.599 2.6220 66.599
Ring Groove Side Clearance .0020 .051 .0020 .051 .0020 .051 .0020 .051
1st & 2nd Comp. .0050 .127 .0050 .127 .0050 .127 .0050 .127
Ring Groove Side Clearance .0050 .013 .0050 .013 .0050 .013 .0050 .013
Bottom Oil .0035 .089 .0035 .089 .0035 .089 .0035 .089
Piston Skirt to Cylinder .0040 .102 .0030 .076 .0030 .076 .0030 .076
Clearance .0058 .147 .0056 .142 .0056 .142 .0056 .142
Ring End Gap .010 .254 .010 .254 .010 .254 .007 .178
.020 .508 .020 .508 .020 .508 .017 .432
Cylinder Main Bearing 1.0005 25.413 1.0005 25.413 1.0005 25.413 1.0005 25.413
Diameter 1.0010 25.425 1.0010 25.425 1.0010 25.425 1.0010 25.425
Cylinder Cover / Flange 1.0050 25.413 1.0050 25.413 1.0050 25.413 1.0050 25.413
Main Brg. Diameter 1.0010 25.425 1.0010 25.425 1.0010 25.425 1.0010 25.425
Note A: OVRM60, 21000 spec. numbers with a "B" suffix and all OVRM 65, 22000 spec. numbers have a displacement
of 11.9 (195.04).
Note B: All OVRM 60, 21000 spec. numbers with a "B" suffix and all OVRM 65, 22000 spec. numbers have a
2.795"/2.796 (70.993/71.018) Bore.
Note C: All engines equipped with a ball bearing will have "0" End Play.
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