1986 Honda CB700SC Fuel Metering & Tank Parts

The valve is vacuum operated, so ON alone does not open its diaphragm. Check it using Honda’s hand-pump test and inspect the supply and strainers if flow remains restricted. Conversely, fuel flowing through the disconnected outlet without applied vacuum calls for diaphragm inspection.

Honda specifies checking 18.5 mm with the tang just contacting the float valve, then replacing the float assembly if it is outside specification. The CB700SC procedure does not call for bending the tang. Also inspect the mating valve and seat rather than assuming the float alone causes the problem.

No. Its product body and vehicle application both stop at 1985. The float, float needle and petcock kit shown here explicitly include 1986, but that does not extend another kit’s range. Identify the fitted carburetors and obtain an exact application before ordering an earlier-year kit.