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