Dellorto Vespa Carburettor Throttle Slide (Typ 8492-5) T5
The throttle slide limits the amount of air passing through to the engine. The further the throttle slide can be opened, the more air can pass through. Some throttle slides have cutaways for air pockets on the inside of the part. These cutaways add additional air to the petrol mix, resulting in the scooter running leaner. If the slide has a flat underside, they do not add any additional air to mix and is therefore perfect for compensating for a leaner mid rev range.
Some types of slider (e.g. 8492-5 orig. T5) have a small pocket at the beginning of the slider at the left corner, seen in driving direction. This ensures a bypass of the auxiliary nozzle with little slide stroke. Here the transition area from idle system (mixture screw) to mist eliminator supply is increased, the mist eliminator starts to deliver mixture earlier with the same slide position. Ideal if thermally critical engines are to be operated at high speeds (highway) with little slider stroke (slipstream).
Comparison No. 0849205_64, 242415 (PIAGGIO)
