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Message: [QUOTE="76GMC1500, post: 1190682, member: 73139"] Changing the oil mixture is not the way to fix a foulding problem. I've run bikes between 16:1 and 40:1 in all kind of conditions, with a cold plug, without ever fouling the plug. You probably need to rejet. It sounds like the transition from the slow speed circuit to the mid throttle is getting to rich. I would first try raising the position of the clip on the trottle needle one to two positions. This will lean out the part-mid throttle a little bit. It costs nothing to do and will give you a bit of a baseline as to where to start. [/QUOTE]