It sounds more like its running too rich and fouling the plugs with carbon deposits,you should really use the standard carbs for it or at least use the standard jets from the set you took off also make sure the air filter is clean and the mouth for it where it gets its supply of air from is free from any obstruction i.e a bag or pair of gloves under the seat!!thats quite common believe me ,also make sure the fuel tap is working ok and its not allowing fuel to get into the vaccum pipe and into the top of number 3 carb where it fits on the diaphragm cap,ok good luck adam
adam bike doctor
March 2006
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