Waaay old thread that recently got revived but it makes sense: it's a good topic, maybe always relevant.
I just got a replacement crank for my bitsa VBB project that will use an otherwise original VBB motor with a total rebuild. This crank happens to be a Mazzucchelli AMT 132 (indicated as replacement for VBB, GL, super, Sprint etc), but the cryptic literature in the box alarmed me
Referring to its "advanced crankshafts,"Mazz says:
"We recommend the use of a lightened fibre flywheel (max weight 1600 g) to avoid great vibrations and the inevitable breaking of the flywheel shaft, valve widening and lightenings etc."
Does this qualify as one of their "advanced" cranks? I wasn't planning on replacing the stock Piaggio VBB flywheel (2400 g) and stator, though, for now.
And, after re-reading this thread, it sounds like a lightened flywheel actually created problems with clutches for many riders.
So... can this crank flyside taper handle the original VBB flywheel, or not?
(Edited to correct kg to g)
Last edited by zachyzach on Thu, 16 Mar 2023 12:02:26 +0000; edited 1 time