Re: noob to the motorized bicycle scene
I use ebay kits myself and all the china two strokes are basically the same, no matter the claims of certain sellers. The only people I know of actually upgrading the china kits are arrow and dax, and the prices of both reflect it.
If you continue to overheat, CR machine and Arrow make a heads and several members have been using puch moped heads with good results. Search puch head for more info.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.