Scooterotica

I've recently bought two stainless rear hub nuts from different suppliers, neither of which will go on my layshaft.

The old rusty nut runs nicely up and down the thread by hand, but i cant get either of the stainless ones to 'start' or go on by more than half a turn...the first one I put down to a dodgy one but to have two that both do the same makes me wonder.

I'm very reluctant to attempt to screw these on using any force at all as I don't want to b*gger the threads on the layshaft.

Thoughts?

Scooter restorations for things like this eveytime

Sounds like your old nut has been forced over a damaged shaft for some time and has got suitably bedded in. If you can't even get the new ones to start it may well be that the end of the axel has been hit a few times with a hammer previously (a bad technique for removing a stuck hub).

You can fix this by recutting the thread with a large die and holder but there is only so much you can do as the shaft is hardened and this tends to bu**er up the die pretty quickly. Failing that it is thread file time, if the damage is small & local but that is hard work on a hardened surface. The thread size you require is M16 x 1.5 you can pick up the dies for about £20 on Ebay. The die nuts might be more suitable if the engine is in the bike but I prefer the die and holder as it is a bit more controlable.

Try the nuts on your rear shocker or engine bar. If they go on those then it's the layshaft that's the problem.

Ah ok, good call, all three nuts run nicely on the shocker mount.

Looking closely at the old nut it does seem to have a little 'rolling' of the thread in the first couple of turns though the threads on the shaft actually look ok, that's obviously the problem.

Will have look for the die or the thread files, cheers.