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The key parts of a carburetor are as follows: 1. A variable-sized "pipe" through which the air can flow; variable-sized, so the rider can increase and decrease the amount of air (and petrol, see below) that goes into the engine. 2. A small open-ended tube holding petrol with the surface of the petrol at a controlled position, and a mechanism for adjusting the surface area of the petrol. typically, the height of the petrol is kept constant by having the other end of the petrol in a chamber with a float and valve. The area of the petrol surface - which dictates how much petrol evaporates as the air rushes past - is adjusted by having a tapered needle reducing the area of the petrol surface. The vertical movement of the needle is irrelevant; what matters is the variation in area of the needle and hence the variation in petrol surface area. Key vocabulary are the "throat size", ie diameter of the air space, and the "jet size", ie the size of the tube holding the petrol where it can be sucked in with the air. Everything else is refinement. John (ex-motorcyclist; BSAs, Yamahas, BMWs), England.

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16y ago

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