The factory JIS screws holding your CB350’s carburetor float bowls and diaphragm covers in place are almost certainly stripped, rusted, or both. This stainless steel allen bolt set replaces those worn-out JIS fasteners with hex socket head bolts that won’t cam out — making carburetor service faster and cleaner every time you work on the bike.
Honda used JIS (Japanese Industrial Standard) cross-head screws on the factory carburetors. They look like Phillips but have a different flute pattern — and after 50 years of mechanics using standard Phillips drivers on them, the heads are chewed up. Stripped screws mean you can’t get the float bowls or diaphragm covers off without damaging the fasteners further.
This CMC-designed bolt set replaces all the JIS screws with stainless steel allen head bolts and washers. Allen heads don’t cam out the way cross-head screws do, and stainless steel won’t rust. Once installed, you can pull the float bowls and diaphragm covers with a single allen key — no more fighting stripped screws every time you need to clean a jet or check a float.
Note: Each kit covers ONE carburetor. You need TWO kits to do both carbs on the bike.
Difficulty: Beginner
Tools needed: Allen key, Phillips or JIS screwdriver (to remove old screws)
You can swap the bolts with the carbs still on the bike — just replace them one at a time. It’s easier with the carbs removed, but not required.
You need TWO — one kit per carburetor. The CB350 is a twin with two independent carbs, each with its own float bowl and diaphragm cover.
No. The CB360/CL360/CJ360 and CB450/CL450/CB500T use different carburetors with different bolt patterns. This kit is specifically for the CB350, CL350, and SL350 K0 Keihin CV carbs.
The SL350 K1 and K2 do not need replacement bolts — this kit is specifically for the SL350 K0, which shares the same carburetor hardware as the CB350 and CL350.
Last updated: March 2026
