I have an 87 250R. Bike runs great just riding around. If I run it through the gears and hold it pined it acts like it runs out of gas. Bike will almost just kill and if I stop it wont idle without pumping the throttle. After 30+ seconds it recovers and is ready to go again. I have went through the obviose to me. Float level is great plug looks great. Carb is clean. Float bowl fills right up with fuel. Cleaned in tank filter. Compresion is great. Tried new plug and coil. Air filter is clean. Just looking for ideas. Any help would be appreciated.