Hi, new to the forum posting but I've red it "all" almost.. As the title says, my wr400f -00 wont rev past 5-6000rpm, it used to run smooth and hitting all the high rpm without a problem. It runs smooth and strong until then, starts fairly easy. What I've checked: Cleaned the carb 4-5 times, all is clean and everything is ok. Measured all the electronics that the manual says, everything is within the correct resistance (ohm) Tried running without TPS, neutral switch or kill switch. Still the same thing, no difference. Changed plug (which looks good). Grey wire is not an option since it is a EU model. The sound is something like the rev limit hits it above 5-6krpm, almost like choking but not at the same time.. sound like a electric thing.. Not checked the timing, but shouldn't it be noticeable before or just idling/starting? I've ordered a main coil, just to try something.. but meanwhile.. someone has any ideas? br Johan, Sweden.