MAZZUCCHELLI AMT 166 Crankshaft for Vespa PE / PX 200 - Rainbow -

Racing crankshafts are a simple and highly effective upgrade for any rotary valve engine. These shafts increase the engine's ability to reach higher speeds, providing greater agility and responsiveness. They improve both acceleration and top speed thanks to significantly longer intake timing compared to standard crankshafts. This translates into higher fuel density and more optimized flow.

The crank flanges are streamlined and polished to reduce turbulence and improve flow. The connecting rod is precision-finished and polished, with the lower connecting rod bearing made of silver material for increased durability. All crankcases feature high-quality bronze connecting rod bearings. MAZZUCCHELLI racing crankshafts offer tight manufacturing tolerances, low bearing play, and excellent value, ensuring high performance and long-lasting durability.

We also offer a finely balanced version, featuring a 12 o'clock balanced connecting rod, which ensures extremely quiet operation. MEC EUR crankshafts are made from a premium molding compound, ensuring high RPM stability and exceptional strength. Pinasco racing crankshafts feature polished slim flanges and high-quality connecting rods with silver bearings and the Pinasco logo.

For optimum lubrication, these shafts are equipped with additional holes or slots.

Results: These crankshafts can also be used successfully with original cylinders, achieving significantly improved performance.

**Racing Crankshaft Specifications:**

- Type: Racing crankshaft

- Stroke: 57 mm

- Connecting rod: 105-110 mm

- Oil seal diameter: 24 mm

- Bearing diameter: 25 mm

- Cone with M12 thread

- Including connecting rod bearing

Suggestions:

- Be sure to use new bearings, sealing rings and crankshaft key.

- Also consider a new set of gaskets, clutch and flywheel wheel nut.

- For optimal performance, match the crankshafts with a touring-racing cylinder and a suitable exhaust system such as SIP Road, Plus SITO or Performance SIP .

- Adjust ignition and jets to optimize performance.