Set the valves at correct TDC ;-)
Runs out of puff at 50mph? 3rd gear should hit well over 60mph before redlining... So something is definitely off.
Still not 100% certain on which bike we speak of, xt660r should be the never 5 valve fuel injected ones. Theres dedicated forums for them, and peaople acchieve around 50hp meassured at the real wheel after mods. But you talk about jetkits, carbs ect...?
/me be like
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