Call this guy..
.Louie Peverini
Scooter Parts International
800-591-2670
Scooter Parts International "
http://www.spi-parts.com/He just made a deal w/ us for dealer pricing. Do us ALL a favor... If you call him, and say you have 400.00 to spend don't waste his time, and say I have to ask my GF. Be prepared to spend, and get the results you want.
I promise you on my dogs lives... Whatever you are looking at elsewhere is going to be close to DOUBLE what you can get from Louie. Don't take my word... Call him, and tell him you want to sign on as a dealer thru the forum
I would suggest a pipe, a couple carb jets, Contra spring and a variator with a roller tuning kit. You might even be able to pick up a clutch all within your budget.
Stay away from Ebay for 2 stroke parts.
There is SOME good stuff but mostly crap. I know. I bought at least one of everything.