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Front fairing and windscreen is worth 15-20mph top-speed.
Tucking in tight with chin on tank, mirrors folded back, elbows and arms in with only pinkie finger holding throttle WOT is worth about 5-10mph.
You’ll also want to redline every gear on way because max-power occurs at 13k-rpms on pregen 250. That’s 14k-rpms and if you’re not revving it that high, it won’t have power to accelerate in next gear. Engine puts out 28hp at 13k, but only 15hp at 6.5k. So redline 3rd gear, then 4th gear, and most likely you won’t even redline 5th at 100+ on speedo.
Is engine running smooth all way up to current top-speed?
When was last time valve adjustment done? How far out-of-spec were they?
Do compression test to gauge health of engine.
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