Crankshaft MAZZUCCHELLI AMT 158 For Vespa 50 / PK Corsa 43 Cone 19 Bi

Racing crankshafts are an essential and highly effective tuning step for optimizing any rotary valve engine. They allow the engine to rev higher, giving it greater liveliness and agility. The prestigious racing crankshafts from the renowned Italian company MAZZUCCHELLI are distinguished by their minimal manufacturing tolerances and limited bearing play, thus ensuring resistance to high rotations and exceptional durability.

In contrast to the original crankshafts, the racing crankshafts have a significantly extended input stroke time, thereby increasing the charge level. The crank arms are flow-optimized and polished, reducing turbulence and improving flow. A polished connecting rod and a lower connecting rod bearing, similar to a silver bearing, meet the highest performance standards. All crankshafts are supplied with superior connecting rod bearings.

Those looking to upgrade to electronic ignition should opt for the 20/20mm stroke crankshaft. It is recommended to use it in combination with a racing cylinder for a thicker and more stable cone. The ETS crankshaft is particularly suitable for high-revving engines, equipped with high-performance cylinders or very light flywheels, thus eliminating the risk of crank stub breakage. A set of conversion bearings and the corresponding oil seal are included in the V50/PV/ET3/PK engine cases.

The RACE version of the connecting rod is reinforced and features additional lubrication holes at the top (for the 125 series only) and lower lubrication slots, ensuring greater stability and allowing an increase in rpm thanks to improved lubrication.

In conclusion, installing a racing crankshaft is not only a good idea in combination with a tuning cylinder, but can also lead to a significant increase in performance even with an original cylinder. MAZZUCCHELLI stands for long-lasting and reliable products.

Racing Crankshaft Specifications:

- Type: Racing/racing crankshaft

- Dimensions: 43mm diameter, 87mm stem

- Housing oil seal diameter: 19mm

- Bearing diameter: 20mm

- Cone with M10mm thread

- Including crankshaft bearing

Suggestions:

- New bearings, sealing rings and keys are essential

- Recommended seal, clutch, flywheel and nut kits

- Ideal for VMC racing cylinders with rotary valve, as well as for Pinasco, POLINI , MALOSSI , DR, and other high performance cylinders.