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help 99 yz250

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Need some help guys. Looking at a friends 99 yz250. Not running good. Has no real power upper mid to top. Bottom is crisp and I can blip the front wheel up w/out much trouble. When I rev it out it just feel flat. No spitting or sputtering anywhere, just flat compared to all the other 250s. He has checked the reeds and jetting, (one up from stock). The bottom end is fresh and the comp is ok but not like new. My guess is the power valve is not opening up. I had this type of problem on a kx250. Any thoughts? Anyone got a diagram of the power valve set up? He needs a manual but has not bought one yet. Anyone know the the stock jetting so I can be sure? Any help would be great. Thanks.

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