Hi I'm not the expert but it seems like the bike needs valve cleaning and adjusting, just apply fine robbing paste on the seats of the valves and valves it self and adjust them as best as possible. I have the same issue, working on it right now. I've done this in the past on KTM 450 sx 2006 and worked well. I'm still running stock valves so once they get older there is soot and carbon accumulation.
Is it powerfull when it becomes hot or is it sluggish :?
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