Mazzucchelli full circle HPC crankshaft for Vespa PX200 scooters.

The basic idea behind the full circle crankshaft is to enable an increase in the compression of the fuel mixture before it reaches the combustion area above the piston (HPC). With crankcase reed valve motors it cannot be helped that the full circle crankshaft crank webs interrupt the gas flow within the crankcase rather abruptly. The use of a cylinder where the carb is directly mounted onto it, release the true potential of a HPC crankshaft design. This combination allows higher engine revs and extra power.

Stroke = 57mm
Conrod length = 110mm
Crank pin = 16mm

*Supplied with small end bearing

Mazzucchelli AMT166VT