Originally Posted by JLock

I have been having similar problems like you. In Texas, the temp/humidity changes can be dramatic but I still have the same problems as you. I have even shimmed the motor (0.2mm shim) but still I can't get the motor to perform unless it is around 260 to 270 degrees. I was thinking about changing the carb to the trusty Novarossi MT12 on like I did with my older Sirio motors. It fixed those and they run strong at my local club tracks.