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Specification LAV/H30 LAV/H40 LAV/H50 V/H70 VM/HM100 ------------------------------------------------------------------------------- Horsepower: 3 4 5 7 10 Displacement (cubic inches): 7.75 10.5 11.5 15.0 20.2 Bore: 2.3125 2.625 2.75 2.75 3.187 Stroke: 1-27/32 1-15/16 1-15/16 2-17/32 2-17/32 Timing Dimension: .060 .035 .035 .050 .070 (before TDC) Point setting: .020 .020 .020 .020 .020 Spark plug gap: .030 .030 .030 .030 .030 Valve Clearance: .010 .010 .010 .010 .010 Valve seat angle (degrees): 46 46 46 46 46 Valve spring free length: 1.135 1.135 1.135 1.462 1.462 Valve seat width: .035 .035 .035 .042 .042 .045 .045 .045 .052 .052 Crankshaft end play: .005 .005 .005 .005 .005 .027 .027 .027 .027 .027 Crank pin journal diameter: .8610 .9995 .9995 1.1865 1.1865 .8615 1.0000 1.0000 1.1870 1.1870 Connecting rod bearing diam: .8620 1.0005 1.0005 1.1880 1.1880 (crank pin journal end) .8625 1.0010 1.0010 1.1885 1.1885 Crankshaft diameter: .8735 .9985 .9985 .9985 1.1870 (cover/blade/PTO) .8740 .9990 .9990 .9990 1.1875 Main bearing diameter: .8755 1.0005 1.0005 1.0005 1.1890 (cover/blade/PTO) .8760 1.0010 1.0010 1.0010 1.1895 Crankshaft Diameter: .8735 .9985 .9990 .9985 .9985 (flywheel/magneto) .8740 .9990 .9995 .9990 .9990 Main bearing diameter: .8755 1.0005 1.0005 1.0005 1.0005 (flywheel/magneto) .8760 1.0010 1.0010 1.0010 1.0010 Camshaft bearing diameter: .4975 .4975 .4975 .6230 .6230 .4980 .4980 .4980 .6235 .6235 Piston diameter: 2.3090 2.6260 2.7450 2.7450 3.1817 2.3095 2.6265 2.7455 2.7455 3.1842 Piston pin diameter: .5629 .5629 .5629 .6248 .6248 .5631 .5631 .5631 .6250 .6250 Width of comp. ring grooves: .0955 .0925 .0795 .0795 .0955 .0977 .0935 .0815 .0805 .0975 Width of oil ring grooves: .125 .156 .1565 .188 .188 .127 .158 .1585 .190 .190 Ring end gap: .007 .007 .007 .007 .007 .020 .020 .020 .020 .020 Top piston land clearance: .0105 .0165 .024 .023 .029 .0145 .0215 .027 .028 .034 Piston skirt clearance: .0025 .0045 .0045 .0045 .028 .0040 .0060 .0060 .0060 .053