Carburetor Float Level Gauge

Why You Need This: A key adjustment that must be checked anytime you rebuild a carburetor on your vintage Honda (or any motorcycle) is setting the proper float level or float height on the your carburetor float. Every carburetor model has a very specific height (or level) that the float must be set at in order to keep just the right level of fuel in the bowl. Too little fuel in the bowl will result in fuel starvation at higher engine speeds. Too much fuel in the bowl will cause the carburetor to overflow and flood with gasoline. 

Our Common Motor carburetor float gauge lets you quickly and easily check the float height on any motorcycle carburetor. Fully adjustable to measure the floats on a wide range of motorcycle carburetor styles. Gage is marked in cm (1, 2, 3), thus make sure to add the "0" to get mm. Made from stamped steel and laser etched; this is another toolbox staple that you should round up if don't have one yet. 

Standard Honda Float Heights:

CB175 / CB200: 21 mm

CB350 Round Style: 24-25 mm

CB360: 16-17 mm

CB450 / CB500T: 20 mm

CB500 / CB550 K& F: 22 mm

CB550 K3&K4: 14.5 mm

Installation Tip: Float height should be checked on both sides of a two float carburetor (i.e. all our bikes except the 450).  Float height is measured from the float bowl edge to the center. Tilt your carburetor just so that the float makes contact with the float pin, but does not compress the pin spring. Make sure to check the float height at the middle each of the floats. Refer to the factory service manual for your model of bike for exact details on setting float height for your particular motorcycle.