i've sheared two crankshaft woodruff keys in the past month. the magneto comes loose and i see that the woodruff key is shorn in half.
these are the only times this has happened. both times this has happened i've been riding pillion.
TOP 12mm crank
malossi multivar variator with 4 and 8 gram weights
malossi 9:1 gears, malossi belt
i've fixed it both times and it's fine now, but am not sure what caused this.
when reassembling the magneto, i see that the flywheel spins freely, though loosely. but when i tighten down the variator it's tight and fine.
actually, last time this happened, i noticed that the variator nut was loose. maybe it is as simple as that.
but anyone else have this happen? what a bitch it is to drop the engine and pull everything apart just to replace the little crescent shaped metal piece.