Scooterotica

I managed to wreck the flywheel on my vespa a couple of weeks back through over tightening the nut, which stretched the boss & lead to the flywheel nut working loose at speed & shearing the woodruff key. I didn’t have a spare with me & so ended up doing a 4 mile walk of shame home...

Anyway - a new replacement flywheel arrived today so I’ve tried fitting it tonight, but once I start to tighten the flywheel nut the crank doesn’t want to turn & if I try to torque the nut down it basically locks solid.

There’s no signs of the new flywheel binding against the stator/casing - so would this point to an issue with the fly side bearing - or worse - the crank?



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Possibly if the crank is twisted ?
can you not try the new flywheel on a mates bike to see if it fits & runs ok

See if it's binding on the stator bolt heads, they're usually awfully close....

What origin is the crank and the one it replaced? Like for like?

Ment so say flywheel not crank!

It’s a Pinasco Flytech flywheel - and after having had another look at it tonight, the problem is definitely with the new flywheel.

I’ve tried a standard Piaggio stator & flywheel on tonight & that was fine, no binding & engine turns free - so no issue with the crank - thank god.

When I’ve had a better look at the new Pinasco flywheel the outside diameter of the boss is bigger than that on the old one for some reason - so when tightened, the end of the boss/taper was fouling against the stator & wouldn’t turn.

Yet another expensive part that’s not fit for purpose!


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If you know someone with a large enough metal lathe they might - I say MIGHT - be able to shave enough off the binding areas that the flywheel would then fit properly.


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