A
necessary component of a motorcycle engine. Some
people didn't realize that a motorcycle has a
carburetor, but it does. Like an automobile, they
need a carburetor.
Motorcycle Carburetors are easy to understand once
you have read up on how they work. Here we will give
you a brief description on what exactly a motorcycle
carburetor does.
Basically what a carburetor does is regulate engine
speed. It does this by metering the amount of air
and fuels required, to sustain combustion per the
impute of the throttle servo. If the engine is in
low speed idle, you would have a small amount of air
and fuel entering the engine. This would in effect
lower the chemical energy entering the combustion
chamber thus lessen the engine power and
subsequently lower the RPM's (Revolutions per
minute). As you open the throttle (speed up) the
carb will allow more air and fuel into the
combustion chamber increasing the speed and rpm's.
The first principle you need to understand is
atmospheric pressure. Atmospheric pressure is the
pressure exerted by the atmosphere, not merely
downwards, but in every direction. It amounts to
about 14.7lbs on each square inch (PSI). By being
able to manipulate the pressure in the engine and
carburetor, you can change the pressure in the air
and fuel.
Atmospheric pressure forces high pressure to low
pressure. When there is low pressure in the
carburetor, high pressure that is formed outside of
the engine and carburetor force their way into the
carburetor and engine until the pressure is
regulated. The air moving through the carburetor
will pick up fuel and mix together using the Venturi
Effect.
The Venturi effect is what allows the carb to pull
fuel form the fuel tank to mix with the air. This
rule states that in a converging funnel, the
entering fluids velocity increases as it passes
through a reduction in the funnels throat diameter.
This increase in fluid velocity decreases the
localized pressure at the venturi throat to below
atmospheric pressure. This low pressure region is
exactly where fuel enters the carburetor throat.
Recommended Carburetors:
Helix Racing,
MSR,
Ready Racing
Featured Motorcycle Carburetors
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