Keihin Carburettor Main Jet

The Keihin Main Jet mainly changes the mixture on full throttle openings but changing the size of the jet also affects the mixture throughout the the full throttle range.

The most popular size main jet for trials bikes in the UK is a 125, warmer climates or higher altitudes have less oxygen in the air so require smaller jets.

6mm Hex head
M5 x 0.8 Thread
16.5mm Length

Keihin Part Number: 99101-357