Crankshaft MAZZUCCHELLI AMT 162 for Vespa PX 125 - 150 - Advance -

Racing shafts are a simple yet effective tuning upgrade for any rotary valve engine. These shafts increase engine rpm, giving you more agility and liveliness. They improve acceleration and allow you to reach higher top speeds. Compared to an original crankshaft, a racing shaft has significantly longer intake times, allowing for more fuel to be filled into the cylinder. The crank flanges are streamlined and polished, reducing turbulence and improving flow. The connecting rods are meticulously finished and the lower rod bearing is a silver bearing type. The high quality racing shafts from MAZZUCCHELLI in Italy feature tight manufacturing tolerances and low bearing play, ensuring high performance and exceptional durability over time. We also offer a carefully balanced version, characterized by extremely quiet operation. MEC EUR racing shafts are made of a high quality stamping compound, ensuring high RPM stability and exceptional strength. Pinasco racing shafts feature thin flanges that are polished. The connecting rods are high quality, polished and feature the Pinasco branding, along with a silver bearing. For optimum lubrication, they are equipped with additional lubrication holes.

Results: These racing shafts offer remarkable performance and do not need to be matched with a tuned cylinder; better performance is achieved when used with the original cylinder.

**Racing Crankshaft Specifications:**

- Type: Racing crankshaft

- Stroke: 57 mm

- Connecting rod: 105-110 mm

- Crankshaft profile: 25/24 mm, M12 thread

- Diameter of the generator side flange: 95 mm

- Diameter of the rotary valve side flange: 97.9 mm

- Partial positioning at 12 o'clock

- Lower connecting rod bearing: silver bearing

- Connecting rod length: 105 mm for 125/150 cc cylinders, 110 mm for 200 cc cylinders

- Stroke: 42mm for T5, 57mm for PX

- Fits 24mm rings, fits 25mm bearing

- Cone with thickness and M12 thread

- Includes connecting rod bearing

**Advice:**

- It is essential to use new bearings, crankshaft sealing rings and key.

- We recommend using a new set of gaskets, clutch and flywheel nut.

- A great addition would be a touring cylinder and exhaust system, such as SIP Road, SITO Plus or SIP Performance.

- Adjust ignition and carburetor jets.