I've got one for you, Gray. I checked the resistance (between yellow and black) of my TPS at closed and opened throttle. It was the same, about 2400 ohms, no matter what throttle setting. It's supposed to be 0 - 2000 at closed throttle and 4000 - 6000 at fully open. I decided to take it off and see if I couldn't clean it out and get it to work. When I took it off, I checked the resistance when the TPS shaft was manually rotated and it checked out perfectly. In the manual (pg 6-9) it looks like there's supposed to be some sort of junction piece between the carb shaft and the TPS shaft that connects them together. As it is, the projection on the carb shaft doesn't reach to the TPS shaft, and it's a female/female connection, so it appears that the little piece is a double male. Ever heard of this? So, my TPS was working but it was telling the CDI that my throttle setting was at idle. Wouldn't that significantly rob full throttle power? Until I find that piece, would you suggest just leaving the TPS unhooked? I forgot to mention, this is on a 2000 YZ426F. Thanks ahead of time.