my budget for parts is around $250 - $350, the bike goes average 25mph but on a nice long flat with no wind in my face i can get it to about 32- 35mph i am looking to get it to go at LEAST 45mph, i have worked on mopeds in the past, owned at least 5 of them in my life, at one point i was able to "resurrect" a puch maxi (i think) that had bin sitting in a garage for almost 30 years... was in BAAAAD shape but i was able to strip it and clean it, then rebuild it and got it tuned up to the point where it was hitting 30mph consistently without having to buy any replacement parts, lucky find i guess lol, so i am not afraid to get down and dirty with any bike and i know if i just knew "exactly" what parts would work on this bike i would have no problem tuning it up after installation, jetting and all that good stuff :)