Description
ProX Keihin Main Jets
ProX Keihin main jets provide replacement sizing options for tuning compatible Keihin carburetors. Select the size required for your engine combination and riding conditions.
Available sizes and quantity
Choose 150, 152, 155, 158, 160, 162, 165, 168 or 170.
Each purchase includes one main jet in the selected size.
What does the main jet do?
The main jet has its greatest influence on fuel delivery at larger throttle openings. It works with the needle and other carburetor circuits, so tuning should account for the complete carburetor setup.
Within the same jet series, a larger-numbered main jet provides a richer mixture. A smaller-numbered jet provides a leaner mixture.
Check compatibility
These are ProX replacement jets for compatible Keihin carburetors. Confirm the required jet series, thread and dimensions before ordering; similar-looking jets are not necessarily interchangeable.
For Yamaha Blaster conversions, match the jet to the installed carburetor. These jets are not listed as replacements for the original Mikuni VM26 main jet.
Selecting your size
Exhaust, intake, engine modifications, fuel, elevation and temperature can affect jetting requirements. Make one adjustment at a time and confirm the final mixture under operating conditions.
Shop more Yamaha Blaster parts at The Blaster Store.
Questions about compatibility or sizing? Contact KOR or call (860) 230-5003.
