Jasil / Top Racing Secondary 15/41 Gear Kit.
A must upgrade for 125cc engines with 172cc conversions to stop the engine from over-revving.
Takes the standard 125cc gear ratio from 3.50:1 to 2.73:1.
Press fit onto Layshaft (Output Axle) and spline fit onto secondary gear, fits both rolling and non-rolling nut 125cc & 180cc engines with this type of fitment.
Out of stock