i fired up my bike today. but the bevel gear wont stay attached to the crankshaft. it turns out that this is what i originally thought was a problem with the clutch engaging. do you have any experience with the crankshaft components? the semicircular bond wont stay in place, so the bevel gear spins freely around the crankshaft transmitting no power. looking at the set up, i just dont see how these parts would wear easily, and anyway the engine is fairly new. i dont know if i need some kind of adheasive or what. i plan on ordering the gear, column bolt, semi circular bond, and round spring gasket. but what if its the end of the crankshaft that these parts attach to ? any help woul be grat. thank you