Crankshaft -MAZZUCCHELLI RACING (for diaphragm intake) full cheek (57mm)- Vespa PX125, PX150

Mazzucchelli Racing crankshaft 57 mm full cheek for Vespa PX125/PX150

The full cheek shafts were primarily developed to improve the pre-compression ratio and thus increase the cylinder filling via the increased pressure in the crankcase. By installing the full cheek, however, the effective cross-section of the intake tract is greatly reduced. This considerably reduces the possible filling level in the upper speed range, and engines equipped with such a crankshaft usually drop sharply in performance at 7,000 rpm. The shaft has lubrication holes at the top of the connecting rod eye, balancing weights and a flow-optimized cutter connecting rod. Mazzucchelli's high-end crankshaft with 57 mm stroke /105 mm connecting rod.

(TW101121)