How do I know what model Walbro carburetor I have? A: All Walbro carburetors have two or three letters stamped or cast on the carburetor body. Most have the two or three letters stamped near the fuel inlet fitting while some have it stamped or cast near the idle and high speed needles.

Hold the throttle wide open for full engine acceleration. Adjust the "hi" screw until the engine smooths out. In other words, the engine should not be missing or have any hesitation. In most cases the "hi" fuel screw will not have to be turned more than a one-quarter turn in either direction.

Walbro is a global organization, headquartered in Tucson, Arizona, with over 2300 employees worldwide. The company has ISO certified manufacturing and engineering facilities in the United States, Japan, Mexico, Thailand and China.

The pressurized air travels through the impulse passage into the carburetor fuel pump; it then presses down on the diaphragm pressurizing the fuel. The pressurized fuel then closes the inlet valve and opens the discharge valve in the fuel pump. From the pump, the fuel travels to the fuel inlet screen.