The Mikuni main jet of 105 mm is an essential component for optimizing your engine's performance. Specifically designed for Mikuni TM, TMX, and VM carburetors, this jet allows you to fine-tune the carburetor to ensure smooth and responsive operation.
By using a larger main jet, you can quickly identify any carburetion issues: if the engine starts to sputter at full throttle, it's time to reduce the jet in 5 mm increments until optimal combustion is achieved. A careful inspection of the spark plug after a full-throttle run provides valuable insights into the mixture: a black or oily plug indicates a mixture that is too rich, while a white plug suggests that the jet is too small, risking piston seizure. The correct mixture is achieved when the spark plug shows a white hue, indicating a perfect balance between air and fuel.
Choosing the Mikuni main jet of 105 mm means investing in the performance and longevity of your engine, ensuring that every ride is an unparalleled driving experience.
- Size: 105 mm
- Compatibility: Mikuni TM, TMX, and VM carburetors
- Function: Engine performance optimization
- Identifying carburetion issues: Sputtering at full throttle
- Adjustment: Reducing the jet in 5 mm increments
- Spark plug inspection: Insights into the mixture
- Spark plug indications: Black or oily = too rich mixture; White = jet too small
- Goal: Perfect balance between air and fuel
- Investment: Engine performance and longevity


