Carburetor Diaphragm | Honda 350-Series Twins

The rubber diaphragms that operate the slides in the Keihin CV carburetors fitted to Honda CB350 / CL350 twins are pushing fifty years old now. Often after five or so decades of use (and typically many years of neglect), the diaphragms have degraded to the point of uselessness. If your diaphragms are cracked or crumbling, we offer brand new versions that are a direct replacement for the OEM models. No need to replace the entire slide. Simply remove the old diaphragm and install the new one.

Note: Our carburetor diaphragms for Honda CB350 / CL350 twins are sold separately. You will need two diaphragms to service a single bike.

Use a light coat of gasket sealer on the edge of the diaphragm covers when installing. While you have the carbs apart to replace the diaphragms, service them with the following Common Motor Collective carburetor parts and rebuild kits: