Difference between revisions of "Choke"

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Revision as of 19:20, 14 August 2006

When starting a moped, or a two-stroke engine for that matter, the ratio of fuel to air typically needs to be higher, or in any case, it is easier to start when this ratio is higher. To accomplish this task, the carburetor is equipped with a choke, which restricts the air intake, essentially increasing the ratio of fuel to air. After the bike is started, the choke is released and the normal ratio of fuel to air is applied.

There are two ways in which choke is typically applied in a carburetor, and this will depend on which carburetor you have. With a "click choke", you apply the choke by pushing on a lever before starting the bike; after starting, the choke is automatically reset to its original "off" position. With a "cable choke", you apply the choke by pulling a lever attached to the handlebar, which is in turn attached to the carburetor via a cable. After starting the bike, you let go of the lever, and the normal fuel to air ratio resumes.

Click chokes are often preferred on dellorto carburetors because with the cable choke version, the choke never fully goes back to its original "off" position. In addition, having a click choke carburetor means there is one less cable you have to deal with, which takes up space and requires periodic adjustment.