  |
||
|
Basic Explanation In-Depth Explanation Diagram Troubleshooting
|
Carbs / Fuel System |
|
|
||
|
|
||
|
Your carburetors are basically responsible for mixing
gas with air at the right precise ratio. This ratio varies as you
"lay on the gas". When the pistons in the engine go down, the
intake valves open up (in Next time you have a straw in a glass of something, try blowing fast over the top of the straw while it’s in the glass. What happens? Depending on the size of the straw and the force of your blow, liquid is sucked up the straw, just like a carb. The smaller the straw, the higher you can draw up the liquid. The carbs are kept full with fuel by the floats and the needle valve. It works like your toilet – after you flush, the float falls down, letting more water into the toilet until it reaches a specific line when the valve turns the water off. The main difference is that your carbs aren’t supposed to let that liquid level drop as much as your toilet does. Otherwise, they wouldn’t be able to effectively suck up the gas.
|
|||||
4-cycle engines) and allow the piston to suck
air through the carbs from the air filter or filter box. As the air rushes
through the throat (or Venturi) of the carb, it creates a vacuum that
sucks gas up through some small nozzles and atomizes it to be pulled into
the engine and burned. The amount of vacuum created is primarily
controlled by the throttle, officially called the butterfly valve.