Tip & How-To about Motorcycles

Carburetors - Motorcycles and Atv's

Hello,
Concerning Motorcycle and ATV carburetors (Carb from here on). NOT fuel injection. There are many variations and brands of carbs. (For this tutorial - we are only going to concern ourselves with vacuum operated, NON - Diaphragm, NON - accelerator pump carbs). They all (supposed to) do the same thing...that is - deliver a metered (proper air/fuel ratio) mixture at all times at any RPM. Vacuum (vacuum is negative pressure) that is created by the (up) and MAINLY down motion of the piston of the intake stroke. The air is pulled through the venturi of the carb (using the vacuum created by the sucking (downward motion of the piston) of the air into the combustion chamber) and when air moves through the venturi, and over the fuel passages drilled (jet passages) into the bottom of the carb throat, it pulls (sucks as a result of the moving air creating a vacuum) fuel up and out of the float bowl through the jets, and is mixed (atomized - more on this later), (hopefully) creating the proper mixture, with the air moving through the carb. The various metering stages of the carb is handled by different jets and air passages. ALL the jets work all the time (to some extent)..ie.. the slide cutaway quits working at WOT because it is recessed completely into the top of the carb body.-- (If its not, you are not getting FULL throttle!!)
After you understand this concept... Please see the next tip.. Idle and low speed details.. ( I have limited space here.) If you have any questions,, please post them to me...next tip -

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