Crankshaft Sport Mazzucchelli small taper Vespa PK 50 S, V50

Crankshaft by Mazzucchelli with small taper for the Vespa PK 50 S.

This racing crankshaft features an extended intake timing and a polished connecting rod.

• Stroke: 43mm
• Needle bearing on top: yes
• Racing crankshaft: extended timing
• Small taper: 19/20mm

The crankshaft also fits Vespa V50 and, unlike the latter, has a needle bearing in the upper connecting rod eye, providing increased durability for tuning.

Standard Crankshaft vs Racing Crankshaft

Timing

Unlike a standard crankshaft, a racing crankshaft is characterized by a modified crankshaft cheek - the so-called "disc valve". The disc valve's cutout is larger, allowing a longer period of mixture flow through the disc valve intake during one crankshaft rotation. A racing crankshaft ensures efficient fuel supply even at high RPMs, providing a linear "power delivery" without drop-offs.
Especially engines with larger displacement and sporty channel design require optimized mixture supply, particularly in the highest gear under full load at certain RPMs.

Connecting Rod

This racing crankshaft features a polished connecting rod. Such a rod reduces flow resistance and mixture turbulence.

Mazzucchelli code: AMT158