June 19, 201610 yr I did not have this issue but tried a 26 mm OKO on a 250 Rev 3. Build quality is not bad but not quite as good a Keihin. I do understand that there are OKO copies that are poorly made. (copies of copies) The bike ran almost exactly the same. There was just slightly less acceleration when twisting the throttle. Due to the smaller size, there must have been less power at WFO but I never get there riding trials.
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