Polini Primary Up-Gear Kit - Yamaha Zuma 4T 50cc

Upgrade or replace the primary transmission on your Yamaha Zuma 4T 50cc with this Polini Primary Gear Set (202.1406). Includes a 16-tooth helical-cut primary drive shaft and a 51-tooth spur-cut crown wheel with a splined bore, both in polished and phosphate-finished high-strength steel alloy.

The Z=16/51 ratio replaces the stock factory primary gears and allows the engine to pull taller gearing for increased top speed once sufficient power is available. Precision-machined to tighter tolerances than standard OEM parts for improved durability and smoother engagement.

Features

• 16T Helical-Cut Primary Drive Shaft and 51T Spur-Cut Crown Wheel — Z=16/51 Ratio
• High-Strength Steel Alloy — Tighter Tolerances Than OEM for Improved Durability
• Taller Gear Ratio Allows Higher Top Speed Potential vs. Stock Gearing
• Polished and Phosphate-Finished Surfaces for Smooth Engagement and Wear Resistance
• Direct Replacement for Yamaha Zuma 4T 50cc Primary Transmission | Polini P/N 202.1406

Specifications

• SKU: 1200-1228
• Polini P/N: 202.1406
• Gear Type: Primary transmission set
• Ratio: Z=16/51 (16T drive shaft / 51T crown wheel)
• Drive Shaft: Helical-cut, polished steel, long splined shaft with stepped journal ends
• Crown Wheel: Spur-cut, splined bore, phosphate finish
• Material: High-strength steel alloy
• Weight: 1.5 lbs

Model Fitment

• Yamaha Zuma 4T 50cc (Minarelli-Yamaha 4-stroke liquid-cooled engine)

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