Yamaha Beluga Z14-43 Polini Transmission

Polini Z14/43 primary transmission for Yamaha Beluga 50, MBK Active / Sorriso 50 and other 50cc scooters, reference 202.1318, designed to lengthen the gearing of the original transmission.

In a tuned 2-Stroke engine, there comes a point when the variator reaches its maximum travel and the engine continues to rev higher without gaining much speed. With the Polini 14/43 gears, a longer transmission ratio is achieved, allowing a higher top speed at the same RPM, provided that the engine has sufficient power.

This gearing is especially interesting on engines equipped with larger-displacement cylinders, carburetors, and sport exhausts, where the tuning allows a longer transmission to be driven and makes better use of the available power.

For installation, it is necessary to disassemble the transmission and replace the corresponding gears. Depending on the fastening system, a press may be required to remove and install the sprockets, while maintaining their original position on the shafts.

Technical characteristics

• Manufacturer: Polini.
• Reference: 202.1318.
• Product: primary transmission gear kit.
• Ratio: Z14/43.
• Front sprocket: 14 teeth.
• Gear: 43 teeth.
• Reduction ratio: 3.071:1.
• Type: lengthened transmission.
• Recommended use: tuned 50cc 2-Stroke engines.

Important: a longer transmission needs sufficient power to drive it. On completely stock engines, it may reduce acceleration without achieving a real improvement in top speed.

Compatible models

FANTIC

• Big Wheel 50

GARELLI

• Pony 50 Racing
• Pony 50 SR

ITALJET

• Bazooka 50
• Pista 50 1992

LEM

• Ghibli 50
• Tornado SS1

MBK

• Active 50
• Sorriso 50

YAMAHA

• Beluga 50
• CT 50