Complete Walbro carburetor
Carburetor Idle Adjustments: There are two visible adjustments, one is the idle (not related to the jet at all), its the cone shaped one, the other is related to the idle jet (this one should be set to 1 turns open to start with, then it can vary from 1 - 2 turns open depending on his air environment, most will run great right at 1 with no fussing). The first thing is safety. Set the idle by either taking the propeller off (but the gearbox ON), or by using a system of restricting propeller movement using a strap or propeller retaining rope. Screw the non-cone shaped adjustment clockwise until it closes (dont put extra pressure on it when it comes to the end, its not necessary and can damage the adjustment screw), then go out 1 turns. Prime and start the engine. If you have an RPM meter, then you should get a nice idle RPM between 2200 and 2600, optimum is about 2400-2500. The motor needs to be above the clickety clack sound of the starter pawls when the setting is too low, and below the clutch engagement RPM (approximately 3000). If there is a tendency to stall or go slow when accelerating the throttle, then the adjustment on the idle should be set open with 1/8 turn increments until you have no problems with instant response.
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