Cracked flywheel Shaft. Do I need to replace?

[StoyStoy]

When removing my flywheel I noticed that the end of the shaft is cracked a little. There are no threads on that part and when everything is back on it’s completely covered. I’m wondering how serious this crack is? And if I don’t fix it would that lead to other problems or would it be dangerous riding the bike?

Thanks

 

[one2dmax]

We've seen that before and seen customers continue use with no ill affects.

 

[Fire-medic]

Wow, just on general principal, I'd expect that to be a no-no for continued use, but if Sean Morley says it's OK, you have to trust he's had experience. That's probably a good choice for remaining stock, no power-adders!

 

[02GF74]

Common practice to stop a crack from propagating is to drill a small hole at the end of the crack, although I've just skimmed a paper that goes one step further by inserting a pin in the hole.

That would be difficult to do with the shaft in situ but had anyone tried it?

 

[one2dmax]

I have seen people simply cut it down until the crack is gone too. The flywheel is located via the taper and keyway anyway.

 

[02GF74]

Interesting info.

I've hopefully not had to look in that area but what causes the shaft to spilt? Is there a tapered bolt that fits into the shaft?

 

[user 16790]

looks like it was forced apart by a 'puller'