My '03 suddenly developed a severe break up in the mid range and would not rev high at all. Traced it to a failed voltage regulator.
A friend's '05 lost power, the engine sort of bogged in the mid range and wouldn't rev out. The power valve linkage had become disconnected (bolt fell out).
Good luck.
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'15 YAMAHA WR250F, '75 YAMAHA TY80 Gone: '00 380 EXC, '03 EC300, '07 YZ250, '07 250 XC-W, '08 YZ450F, '12 CRF250R
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