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Fitting new rods to crankshafts?

Need help with a tuning kit, how do you tune your scooter, which kit should I choose, and all general tuning and modifcations questions are for in here.

Fitting new rods to crankshafts?

Postby Captain Pugwash » Mon Oct 20, 2014 9:20 pm

The Lambretta crankshaft when new the crank pin has an interferance fit of 0.007" of an inch in the crank webbs.
Which is to give the pin enough resistance to help it hold the crank assembly together in use.
This resistance means it usually takes somewhere around 4 ton's to press the standard Lambretta assembly together.

My question....
And I know it's about Vespa's so forgive me please!!!

It's a big ask, but would anyone on this forum know or have the correct figures for a small frame standard 125 vespa crankshaft assembly, both the interference fit and expected press pressures.

Anyone :?:
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Re: Fitting new rods to crankshafts?

Postby Cgt75b » Tue Oct 21, 2014 4:37 am

Captain you maybe better asking this question on the scooterotica forum :roll:

All the best.
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