Yamaha - Carburetor Repair Kit Fuel System Service Kit 6H4-W0093-01-00. Overview. If you've been around Yamaha outboards, you know carburetors don't stay perfect forever. Over time, fuel residue and worn seals start affecting how the engine idles and responds. The Yamaha Carburetor Repair Kit 6H4-W0093-01-00 is what you reach for when it's time to clean things up and get performance back where it should be. It's a solid, straightforward way to bring an engine back to smooth, reliable operation..