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- Lambretta
- Power jet -MIKUNI (type: N100606) TMX 27/TMX 30- (110.0)
This refers to an additional jet system that is only activated under full load. The jet responsible for this is usually positioned close to the air intake of the carburettor. If under full load a large negative pressure is created in the edge zone of the intake funnel, where the nozzle is installed, petrol is injected into the air flow via a hose coupled to the power jet nozzle. The hose leads into the float chamber and receives the fuel there, usually this looks like a riser pipe, in operation you can follow on a test bench with a transparent hose how the fuel level rises with increasing speed and slide opening of the carburettor and then supply the powerjet nozzle with fuel.
The purpose of this technology is to make highly stressed two-stroke racing engines in the full load range safer with regard to their susceptibility to overheating.
However, the Powerjet nozzle size is not added, but the actual main nozzle is chosen to be smaller in relation to it. This has the advantage that the throttle response and the power curve is usually better, without which the engine would then stall under full throttle. Thus also a racing engine can be fired cleaner and with less fuel consumption.
Particularly with a very steep rise of the power curve and a usually associated bad power curve in the lower speed range, the powerjet system can help to realize a well drivable engine.
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