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I also have a BBR ftp 88cc kit on my xr50. I have a stock TRX70 head I could put on it. I'm assuming all I would need is a high compression piston also right? How much improvement over the the stock 50 head would this be? And how much better is it just to go with a TB race head?
 

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You need a different piston if you 88cc kit was originally for a stock 50 head. You will destroy the, piston, valves, and possibly the head and rod/crank due to valves hitting the top of the piston.
 
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