I have a Yamaha QT50. I had been using the same spark plug for a while and it was looking too dark. I started using a Uni pod filter over a mesh filter and also added Boyesen power reeds which are supposed to make it run rich at WOT. I'm trying to get the jetting perfect before adding a kit. So I performed a plug chop. White base, like the plug was never used. Up jetted 10 sizes. I got it warmed up to almost 300*, stuck the new plug in and rode about 3 miles, then killed it going up a hill at WOT, installed the old plug, and rode home. Still completely white. Am I doing something wrong? With the biggest jet, it is sluggish and four strokes, but still no ring. I suspect that the plug is too hot. Can this cause the ring to not appear? Forgot to mention that I've got an SHA carb and a Tecno Bullet pipe for a Tomos A35 on it.