Float Adjustment

FLOAT ADJUSTMENT

Float level adjustment doesn’t require a special tool. You just need a ruler that measures in millimeters. Hold the carb body at about a 30-degree angle from vertical to remove most of the float weight off the spring pin at the top of the float valve. If the spring pin is depressed, then the measurement will be off.

With the end of the ruler resting against the float bowl gasket, set the ruler lightly against the float (Keihin) or the float arm (Mikuni). Measure across the top of the float or float arm. If it isn’t correct (see your manual), then use a small flat-blade screwdriver to bend the flat piece of metal directly above the float valve’s spring pin until the height is correct. Plastic floats are not adjustable and do not need adjustment.