hello all just recently purchased an 87 650sx and having a problem with it. when i start it up it revs up to a high rpm and wotn shut off even when the kill switch is engaged. i even tried pulling the spark plug wires off and it still ran untill i finally flooded the motor out using the primer.i checked to see if the throttle was sticking but its not. the only thing i could come up with is either my jets are way out of wack or something to do with the primer. any suggestions?