Yamaha - Carburetor Repair Kit Fuel System Service Kit 6H4-W0093-03-00. Overview. If you've been maintaining Yamaha outboards for a while, you know carburetors don't stay dialed in forever. Between fuel residue and normal wear, things start to slip-idle gets rough, throttle response drops off. The Yamaha Carburetor Repair Kit 6H4-W0093-03-00 is what you use to bring everything back into shape. Even though this version has been updated to a newer part number, it's still the same kind of fix that