When we raced gokarts, we ran meth, and we would run regular gas and spray wd-40. let the motor idle with the gas for a few mins, then run up the throttle and hit it with a little wd-40. let it catch back up and do that a few times. Then flood the shit out of it with wd-40 until it died.
But that was on a running motor, not sure how you could get the wd-40 to coat everything is the motor is broke down.