I'm new at this site so be gentle. I changed to the Yz timing and snipped the "grey" wire on my WR 426 and took it out last weekend. I noticed at high RPMS that it was cutting out. It felt like a rev limiter but I'm not sure. I'm running the bike with the air box open, plug out of the exhaust and the grey wire cut also the throttle stop has been filed to yz specs. I never felt this before the timing change or the wire being cut. I left my jetting the same as I was running before. A friend told me he had the same thing happen on his 250f when he had filed the throttle stop down to far messing up the tps. My throttle stop was done at the dealer so I haven't checked the lenght. But again it didn't do this before the change. Any help would be great!!!!!!!