The carburettors from the Japanese manufacturer Mikuni are in the reference class when it comes to perfect tunability and thus the highest achievable performance with optimum consumption. Mikuni carburettors 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, because Mikuni carburettors do not run with any carburettor equipment, but only with the really suitable one. But they run perfectly and you don't expose the engine to the risk that it only runs well in some partial load ranges and then goes up in one of the other partial load ranges.
The TMX 38 works well on Vespa largeframe and 180cc automatic engines above 30hp. The basic setup is usually already very good here.
The Mikuni carburettors react quickly to fine contamination of the fuel with an overflow of the float chamber. The TMX 38 offers the possibility to tune the carburettor in the middle speed and slide valve range with the Powerjet nozzle to gain power and reduce consumption. In order to prevent a leaning in the upper slide and speed range, the Powerjet nozzle is used, which additionally feeds petrol into the intake flow due to the high vacuum at full throttle and high speeds.
- Main nozzle: 410
- Idle jet nozzle: 20
- Needle nozzle: R-6 ( 633 )
- Nozzle needle: 6EJ12-56-3
- Starter nozzle: fixed
- Idle jet propeller: 2.0 turn
- Main air nozzle: without
- Power Jet nozzle: 50
- Gas slide: 3.5
- Needle valve: 3.5
- Float level: 20mm
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- Choke actuation: left / knob
- Standing gas screw: left
- Air screw: left
- Outer diameter front: 44mm
- Outer diameter rear: 62mm
- Overall length: 76mm
- Measurement center venturi up: 82mm
- Measurement center venturi down: 80mm
- Fuel supply: left
- Power Jet: up
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