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

Racing crankshafts are a simple yet effective tuning upgrade for any rotary valve engine. These crankshafts increase engine rpm, providing greater agility and liveliness. They improve acceleration and allow for higher top speeds. Compared to a stock crankshaft, a racing crankshaft has significantly longer intake times, allowing for greater fuel filling of the cylinder. The crank flanges are streamlined and polished, reducing turbulence and improving flow. The connecting rods are meticulously finished, and the lower connecting rod bearing is a silver-bearing type. The high-quality racing crankshafts produced by Italian company MAZZUCCHELLI feature tight manufacturing tolerances and low bearing play, ensuring high performance and exceptional durability. We also offer a carefully balanced version, characterized by extremely quiet operation. MEC EUR racing crankshafts are made from a high-quality molding compound, ensuring high RPM stability and exceptional strength. Pinasco racing crankshafts feature thin, polished flanges. The connecting rods are high-quality, polished, and feature the Pinasco logo, along with a silver bearing. For optimal lubrication, they are equipped with additional lubrication holes.

Results: These racing shafts offer remarkable performance and do not need to be paired 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

- Suitable for 24mm rings, suitable for 25mm bearing

- Cone with thickness and M12 thread

- Includes connecting rod bearing

**Advice:**

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

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

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

- Adjust the ignition and carburetor jets.