Hey guys, I'm not having luck anywhere else so I though I would post here and see if you all could help. I have my older 87 xr250r. Bike is completely rebuilt with stock jetting. The carb is completely clean and the bike fires on the first or second kick. Now it will run fine until it gets good and warmed up then it misses in the midrange only. The second you get anywhere from 1/4 to 3/4 throttle it misses and sputters until you hold it wide open and it clears out. All jets are clean, motor is mint, and the airfilter is clean. It will run fine until it warms up. Anyone have any suggestions? Bad coil, CDI, stator?? I've dumped enough money into this thing to buy a newer bike. I'd just like to fix this issue and ride her.