Yamaha - Carburetor Repair Kit Fuel System Service Kit 6H1-W0093-10-00. Overview. If you've worked on Yamaha 90 horsepower two-strokes, you know these motors run strong-but the carburetors need attention over time to keep them that way. I've seen a lot of these engines come in with rough idle or hesitation, and most of the time it comes back to worn internal carb parts. The Yamaha Carburetor Repair Kit 6H1-W0093-10-00 is what brings those carbs back to life without replacing the whole unit. Once