MIKUNI TMX38 carburetor - 38 mm, Powerjet, manual choke
The
carburetors from the Japanese manufacturer
Mikuni belong to the reference class when it comes to perfect tunability and therefore the highest achievable performance with optimum consumption. Mikuni carburetors and parts are manufactured with tolerances of 5/1000ths. This is one of the reasons why they run so perfectly. However, you should take a little time for tuning, as the Mikuni carburetors do not run with just any carburetor configuration, but only with the right one. But then they also run perfectly and you don't expose the engine to the risk of it only running properly in some partial load ranges and then blowing up in one of the other partial load ranges.
The TMX 38 works well on Vespa Largeframe and 180cc automatic engines above 30 hp.
The Mikuni carburettors react quickly to fine contamination of the fuel by overflowing the float chamber. Ideally, therefore, a good fuel filter should be used here.
The TMX 38 also offers the option of tuning the carburettor leaner in the middle speed and slide range with the Powerjet jet in order to gain power and reduce consumption. To prevent leaning in the upper slide and speed range, the Powerjet nozzle is used there, which additionally feeds fuel into the intake flow due to the high vacuum at full throttle and high speeds.
- Main jet: 410
- Idle jet: 20
- Needle jet: R-6 ( 633 )
- Jet needle: 6EJ12-56-3
- Starter jet: fixed
- Idle air screw: 2.0 turn
- Main air jet: without
- Power Jet nozzle: 50
- Throttle slide: 3.5
- Needle valve: 3.5
- Float level: 20 mm
- Choke control: left / button
- idle throttle screw: left
- Air screw: left
- Outer diameter front: 44 mm
- Outer diameter rear: 62 mm
- Overall length: 76 mm
- Dimension center venturi upwards: 82 mm
- Dimension center venturi down: 80 mm
- Fuel supply: left
- Power Jet: top
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