The factory JIS screws on your Honda 350-series Keihin CV carburetors are notorious for stripping and rounding out. This CMC-designed stainless steel allen bolt set replaces those worn screws with hardware that actually grips — making every carb service faster and less frustrating.
After decades of use, the original Phillips (JIS) screws on the diaphragm cover and float bowl are often worn, stripped, or seized. A stripped screw on the diaphragm cover means you cannot access the slide and diaphragm for inspection. A stripped float bowl screw means you cannot clean jets, replace gaskets, or set float height. Replacing these screws with stainless steel allen bolts eliminates the stripping problem entirely and improves the look of your carburetors.
Note: Each kit includes hardware for one carburetor. The CB350 and CL350 are twin-cylinder bikes with two carburetors — order two kits per motorcycle.
Difficulty: Beginner
Our 5-part Honda CB350 carburetor rebuild series walks through complete disassembly, cleaning, and reassembly of the Keihin CV carburetors — including removing the diaphragm cover and float bowl screws this kit replaces.
Two. The CB350 and CL350 have two carburetors (one per cylinder). Each kit covers one carburetor, so you need two kits for a complete set.
No. This kit only fits the SL350 K0. The K1 and K2 models use different carburetor hardware and do not need replacement bolts.
If you are opening the carburetors to replace the screws, it is a good time to inspect the internals. If the bike has been sitting or runs poorly, a full rebuild kit (CMC part 6047) includes gaskets, jets, float needle, and seals. This bolt set handles only the external mounting hardware.
The float bowl screws are accessible with the carbs mounted, but the diaphragm cover is easier to work on with the carburetors removed. If you are doing a full carb service, remove the carbs — you will have better access to everything.
Last updated: March 2026
