I have a yz250 project I have just started. It has been sitting for about 10 years. It needs a lot of work. It runs, but very little power. So a top end is probably in order. When it ran good it fouled plugs, bad. Every cold start it fouled a plug. Anyways, I have been looking for a carb rebuild kit for it but cannot find one anywhere for the 1999. The 2000+ yz250s have a different part number for the carb. Not sure if the 2000 carb rebuild kit would work. I already have stock jets ordered. I figured to get it running right, I will start at stock and tweak the jetting as needed. I figure that sitting so long, new gaskets and orings wouldn't hurt. They are cheap as a kit, and expensive to buy separately oem. If anyone knows where I can find a rebuild kit or of the 99 kit will work, please hook me up!