Scooterotica

Finally got back to working on the 250 after a break.

Took the flywheel off and the woodruff key had sheared

Should I be worried about this happening after only about a dozen kicks and about five minutes of the engine running?

I did notice that there wasn't a lot sticking out of the key in the crank before it, but didn't think it would have been a problem.

In my experience, a sheared woodruff key was caused by the flywheel not being tightened up correctly (slack rather than overtight) and it didn't take much to shear it!! I am not saying that is what caused yours, just that it's what caused mine.

have you lapped the fly wheel to shaft ?....there my be a high spot on the taper allowing movement

Triken wrote:In my experience, a sheared woodruff key was caused by the flywheel not being tightened up correctly (slack rather than overtight) and it didn't take much to shear it!! I am not saying that is what caused yours, just that it's what caused mine.

This was it. I didn't originally have the flywheel tightened.


Thank you

Sorted then!

Yes! I hope!

This happened to me Bilko on my Series 2 , Strobed the timing , left it overnight came back next day and had forgot to fully tighten the flywheel

Toddy wrote:This happened to me Bilko on my Series 2 , Strobed the timing , left it overnight came back next day and had forgot to fully tighten the flywheel

Glad I'm not the only one to forget

At my age I have to check everything twice or I will forget lol

its a bit like forgetting to put your nob away after having a p155