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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Crank won’t turn when flywheel nut is tightened.
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Last edited by cartmel808 on Thu Sep 20, 2018 10:38 pm, edited 1 time in total.
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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
can you not try the new flywheel on a mates bike to see if it fits & runs ok
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See if it's binding on the stator bolt heads, they're usually awfully close....
Life shouldn't be a journey to the grave with the intention of arriving safely in a pretty, well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, loudly proclaiming: "WOW, WHAT A RIDE"
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What origin is the crank and the one it replaced? Like for like?
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Ment so say flywheel not crank!
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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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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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