after reading numerous posts, i see that many people here think that the #3 exhaust valve can contact the piston when the decompression lever is used with the motor running. I will simply say this, the valve will NEVER EVER contact the psiton this way. it simply wont happen.if you pull your decompression lever (on the engine) up all the way (maximum lift), and kick the enigne over slowly, the piston will not touch the valve! I have also provent his theory, accidentally, when in a crash and my decomptression cable got cought in another riders handlebars, ripping it off my hydraulic lcutch mount and fromt he engine, killing the engine. after i reinstalled the new cable, the engine ran just fine, no problems.