The Mikuni main jet of 190 mm is an essential component for optimizing your engine's performance. Specifically designed for Mikuni TM, TMX, and VM carburetors, this jet is crucial for precise tuning. The choice of the 190 mm size allows for better management of the fuel mixture, ensuring efficient combustion and a smooth engine response.
When adjusting the carburetor, it is advisable to start with a larger main jet. This approach allows you to identify the point at which the engine begins to sputter, indicating that it is time to reduce the jet in increments of 5 until optimal operation is achieved. Analyzing the spark plug after a full-throttle run provides valuable insights into the mixture: a black or oily spark plug indicates a mixture that is too rich, while a white spark plug suggests a mixture that is too lean, with the risk of piston seizure.
- Compatible with Mikuni TM, TMX, and VM carburetors
- Size: 190 mm
- Optimization of the fuel mixture
- Ensures efficient combustion
- Facilitates a smooth engine response
- Recommended for precise tuning
- Spark plug analysis for mixture optimization
- Adjustment possible in increments of 5
With the Mikuni 190 mm main jet, every motorcyclist can tackle tuning with confidence, ensuring that their engine operates at its best capacity.


