Hi there! I have the same kit and the manual to, but i dont try to repair my carb yet.
Do you solve your problem?
My engine, sometimes when gets the normal temperature rpm gets up to 2000 several times.... I have to "slap" the accelerator to get rpm down. I run a few more meters and when disengaging the engine or set foot on the clutch, the rpm sets at 2000 rpm or more... again and again...
regards