Front sprocket retainer bolt sheered off

[jmpower1974]

Hi All,

my bike is phaarked. The bolt that holds the front sprocket on came lose the other day and I over tightened it too much - it snapped off. Ive attempted drilling a hole to put in an easy out but I cant get the easy out to bite at all. Im at a loss as to what to do. Any advice greatly appreciated.

[benny hedges]

bash it i with a hammer. it will bite.
dont use one too small though or it might break - and good luck drilling the extractor out lol

[tony.mon]

This one might be tricky.

Try to get the easy-out to bite, and remove the snapped-off bolt that way, but if not you have two main options:
1. Drill out oversize, tap the shaft in situ and fit an oversize bolt- (the next size up English thread might be better than going for M10) This is only an option if the shaft is case-hardened only, rather than hardened throughout. Or
2. Remove engine, change shaft over.
I have spare shafts if needed.

The only other solution would be to have it spark-eroded, but I think that the shaft would have to be removed to carry this out.

I guess you could weld a new sprocket on and sell the bike quickly, but I'd be coming back to see you if I was the unlucky buyer....