Originally Posted by
myst38
Someone please help!!
I am destroying flywheel collets on my GRP at a rate of one per race day. I am tightening the clutch nut quite snug, but sometimes the flywheel spins when on the starter box without turning the engine over.
If i tighten it as hard as I can (with threadlock), the same thing happens and the collet gets destroyed.
The engine is pretty new, 3 gallons, but at the same time, I have used 4 collets. I have tried a new clutch nut, checked the threads on the shaft (look OK, but not 100% sure). Apart from that, can anyone advise as to what may be causing this?
Odds are that the tapered hole in the flywheel is now a little oversized from spinning on the collet. In most flywheels there is a shall shoulder in the tapered bore that the collet can botton out on. This can prevent the collet from going deep enough into the taper to tighten properly. If you file down the small diameter end of the collet about 1/32 of an inch the collet will seat deeper into the flywheel and most likely hold tight again.