If your still looking for parts in the USA. Try BJ Racing, or cheap cycle parts.com. You will not find a 84 TY 250 listing on Cheap cycle parts. But for all your suspension parts use the 86 TY 350 listing. I have the same bike but I am in Canada, Most parts are still available from Yamaha. The only difference you should have in the US is sub the 250 for 350. Most gaskets will be the same accept for the base gasket for the barrel and head gasket. You can also try Ty trails out of the UK and Sammy Miller. Sounds like the bike is a little ruff, might as well make a winter project. Also watch out for the front bake hub breaking as they are prone to do. Try and find a hub for a mid 80's IT 250 or 125 and fit it they are way stronger. The TY front brakes are very good when the get wet. They still work but the IT brake hub is the way to go.