Not sure if you are doing correctly. WOT test will require about 900-1200'. If on a road with phone poles , poles are 300' apart. From a dead stop go full throttle for 900-1200' than while throttle is wide open turn ign off. Do not release throttle until engine dies completely then pull over and pull the plug to inspect. Do not use a new or cleaned plug for a plug already colored will show results much quicker and easier to read. Second, the exhaust does need some back pressure or you will loose performance unless an extreme grind cam is used. You can give me a call and I can explain much quicker and more accurately. 662-301-1563
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