I seem to be the only one in my group except my son because of using the same premix oil and same ratio that fouls plugs.I believe this now to be a oil foul which is caused by using a too high of film strength.Anyone know what rpms these dirt bikes run if run wide out in a gncc and then of course the tight stuff with less rpms.Have to find the right info to find the right oil.Was thinking of klotz tcw3.Thanks for any responses.