New crankshaft doesn't fit


I have got a vespa 50s, and I bought a new mazzuchelli amt120 crankshaft.                                          Only it doesn't fit nicely, it touches the bulb at the inletport.                                                                          I compared the circle diameter of my new cranshaft with the circle diameter of my old crankshaft.They are respectively 86,85mm and 86,15.                                                                                                                  Is the new mazzuchelli not ok and should I exchange it with another one. Or is milling of the inlet port bulb necessary.



Hi Dude ...


Can you give me your customer number ?

What is the building date of your scoot and do you know if you got a v50 or a PK engine ?