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Finally got mine sorted. Wish I'd gone straight to the TPS as that's the only thing that fixed it. Changed every other sensor before I tried it.

Hi guys. I've just picked up a 2014 YZ250F and it's been suffering from the issues in this thread. It would run fine for about 20 minutes then develop a low rpm misfire. If you gave it a good handful of throttle it ran fine, but out of the bends it was becoming a pain. I bought a Yamaha FI...