No need to split the cases, the power valve mechanism is under the clutch cover. On my '03, I recall it was kind of a PIA to get the cover back on with the cylinder in place due to the cylinder to cover seal, but doable.
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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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