Ran the little 50 w/new bpr 4hs after the carb mods, pipe, 70jet and k&n........the color seems right........chocolate, but has only burned one third of the insulator. the other two thirds is white.........not like a burned lean white but just the new plug looking white. Ran it for about 1/2 hr. Is this normal or is it runnin lean? Thanks for all your help! Wayne