vespa: the 7 CRANK CHECK factors / 4 rotary valve / vespa TUNING / FMPguides

in total 7 factors decide on the functionality of your vespa (tuning) crankshaft. its.. NOT enough to trust the info you get from sellers. sry, would be convenient i know.

A: crankshaft and
B: engine case as crank has to fit the case (rotary valve only!)

A crank:
1: centering
2: stumps
3: press fit
4: balancing
5: conrod

B case:
6: rv tolerance 0,05mm
7: intake timings

ranking of the 3 most important factors:
I: 6 - rv tolerance... blowback or not
II: 3 - press fit... twistet cheeks or not
III: 4 - conrod... cracked conrod = engine total loss

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