Hi topped piston vs decompression lever
OK, try this, it should work... smear the piston valve clearances with plasticene, coat the valve faces with oil, crank the motor, with the kick starter through a cycle, measure the exhaust valve imprint depth. Then calculate how much you need to machine the piston crown. Or use a thicker head gasket made of copper and lose some compression. Or not use the auto compression lever, use the electric strarter only. You might be able to adjust the decomp cam to open the valves just off the seats enough to enable starting but without touching the piston at TDC. Did you hear a "bang bang bang" as the valves touched the crown when cranking?
Last edited by tenere_rider; 6 Jan 2009 at 00:16.