I have a 04 yz 85. I recently rebuilt the top end. It sat for 5 years but was properly winterized before it sat. Fuel drained, engine fogger the whole bit. I honed the cylinder and installed a new piston and all that. Started it up, and it acted stuck at about 3/4 throttle. Killed it pulled the carb cleaned the main jet, and the piolet jet. All was very clean and normal looking. Put it back on and started it. Really funny acting about a one second hesitation from throttle to motor response and some more sticking open, the slide functions properly and everything. I believe the problem may be associated with the choke some how. You guys got any ideas, much appreciated.