All Balls Racing – Fuel Valves & Petcock Kits for Yamaha, including fuel tap repair kits for the 1990 XV535 Virago, the 89-23 XV250 and the 92-98 XJ600 Seca II, along with a range of model-specific Yamaha fuel valve kits. Repair kits carry the diaphragm, o-rings, gaskets and screen that fail inside a vacuum-operated petcock; complete valve kits replace the whole assembly when the body itself is corroded or stripped. A petcock is a small part with big consequences. A perished diaphragm lets fuel siphon into the intake and hydrolock a cylinder or flood the crankcase with gas, and a torn o-ring drips onto a hot engine. A clogged pickup screen starves the carbs, which shows up as a machine that runs fine for ten minutes then leans out and stumbles. Rebuilding with a Yamaha fuel tap repair kit gets you clean shutoff, correct reserve function and steady fuel flow at full throttle. These petcock rebuild kits use ethanol-tolerant rubber that stays pliable in modern pump gas. Drain the tank first, and inspect the tank screen while you are in there. Give us your Yamaha model and year and we will confirm the right kit before you order.