Hello, still trying to trouble shoot my 05 WR250F. I think I may actually be nuts and that I may not have an RPM rev limiter problem. I think my Tiny Tach could be a 2 stroke model, and secondly the grey wire mod gave me a bit more mid range that gets me to rev limiter quicker with out as much of a "hit" at the top. Basically the Tiny Tach rev limits at 6000+ which if it was 6500 then 6500*2 puts it pritty close to 1300rpm. Some one mentioned that a spark occures on every motor revolution, though I just talked to Yamaha dealer's parts guy and he said its every 2 revolutions. Again I think between the false info from RPM gauge and different power band after snorkel out and grey wire removed I might just think its not reving as high. Unfortunately with work I have not had but one ride with bike before mods were done. Anyone know for sure if we get a spark every 2 or 1 revolutions?