Good info on the motor over at Thumpertalk in the WR/YZf 250 section.
Getting the WR motor jettted spot on does take a bit of tinkering, but once you have the motor uncorked and jetted correctly, it will scoot.
I am riding my sons '07 WR250f a ton lately and am loving this little bike. Fun, stable, corners very well, e-start and very easy to ride. Again, not a powerhouse, but ride in the upper revs and it will reward you.
Never thought I would say that after 6 seasons on a smoker!
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