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Secondary Gear kit Naraku 14/39 +10% for GY6 125-150cc - NK901.22
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  • SKU: NK901.22
  • Availability: Out of stock

Secondary Gear kit Naraku 14/39 +10% for GY6 125-150cc

$139.99
Shipping calculated at checkout.
DESCRIPTION
The Naraku 14/39 +10% Secondary Gear Kit is an aftermarket secondary gear kit designed for the final drive of scooters equipped with GY6 125cc to 150cc engines (e.g., Honda Ruckus GY6, Kymco, PGO, SYM). This kit replaces the original secondary gears with a 14/39 ratio, providing a final drive ratio approximately 10% shorter than the original.

The secondary drive (sprocket and chainring on the rear axle) converts the rotation of the output shaft (via the clutch/variator) into wheel rotation. The ratio of these sprockets determines the final drive ratio:

Shorter ratio (+10%) → better acceleration and traction, higher engine speed at a given speed

Longer ratio → lower engine speed at a given speed

This kit is particularly suitable if you are looking for:

A more responsive acceleration

More pronounced traction at low/mid-range RPMs

Better use of engine torque

Compatibility with stock or slightly modified engines