1) Float System: The float system regulates the fuel level within the carburetor. Within this system, you’ll find a float, a needle, and a seat. When the fuel level within the carburetor drops, the float allows the needle to move away from the seat allowing fuel to flow from the tank into the carburetor. When the fuel reaches a designated level, the float lifts up, pushing the needle into the seat, stopping any further fuel flow.
2) Idle System: The idle system is what allows your engine to run smoothly at low RPMs. Within the idle system are air bleed holes and idle mixture settings that allow you to adjust the appropriate fuel and air mixture for the engine.
3) Main System: The main system is what delivers the fuel/air mixture to the engine when it’s running under any amount of load or higher RPMs. Within the main system are the main jet and an accelerator pump.
4) Power System: When the engine is subjected to heavy load or high RPMs, the power system is engaged to support a rich mixture of fuel and air. Within this system is a power valve and a high speed jet.
5) Metering Rod System: The metering rod system is a simple setup which uses the movement of the throttle, air flow vacuum and a rod to move the fuel needle up or down to give the desired amount of fuel. As the throttle is opened the engine creates higher vacuum which lowers the fuel needle and allows more fuel to flow through.
6) Choke System: The choke is what allows the engine to start easier in colder conditions. Typically, the choke will automatically activate when the starting temperature of the engine is cold, and shut off once the engine temperature has reached a certain point. There is also a manual choke option which allows the operator to manually engage and disengage the choke.
