Moped Carburetors
   Moped Carburetors | Fuel Injection

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Moped Carburetors

With a modified moped carburetor, better gas mileage or faster speeds can be attained. Stock manufacturers design their carburetors for a certain size engine and RPM range. But adjustments and modifications can improve performance to these stock items. Overboring the cylinder creates a larger combustion chamber that needs more fuel and air. Adding a high performance carb can improve the performance of any moped, provided that other modifications are made along with it. However, other changes to the engine might require considerable mechanical expertise.

The motor scooter that is not running well might just need the carburetor to be cleaned. Because the carburetors on these miniature motorcycles are so simple, dis-assembly and cleaning is not too difficult and will consist of disassembling only a few parts. The fuel bowl and float are to primary components of any carburetor. The float rises and lowers with the level of the fuel in the fuel bowl. As the float rises and lowers, it moves a needle valve that allows more or less fuel to enter the bowl where fuel is stored in reserve of being ducted through the venturi, where it is mixed with air, and later burned in the engine after it is sucked into the compression chamber.

A few bolts usually hold the carburetor to the engine, and a few screws hold the carburetor together. When they are removed, the carb should disassemble right apart. There are several needle valves on the carburetor, including the 1) idle air, 2) the main jet, 3) base idle, and 3) slide needle. These can be turned with a flat head screw driver, and should be removed to be cleaned with the rest of the carburetor. Any dark brown coloring is residue from gasoline additives, and should be removed with a carburetor cleaner solvent, and possibly gentle scrubbing. However, at no time should a wire or any mechanical instrument be pushed through any of the port jet holes though or the holes where the needle valves admit fuel, as these are precision machined and even a scratch could modify the operational characteristics of the carburetor.
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