spark plug

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trying to jet my carbon my rappy 350 for my hmf slipon the stock main jet was 142.5 i went up to a 150 and it idles ok not the best and i plug the plug to see wht it looks like and its black so im running ric.. so i put it back in and go out and ride it hard and come home plug the plug and it lightens in color to a greyish color.... could it be my needle jet needs to be adjusted???? n/e suggestions..
oh ya and move this to quadrelated problems if you want to
 
I go with light chocolate to tan...If its grey it makes me nervous....Aluminium burnt off your piston makes grey spark plugs ...Thats how I was taught.....Maybe you want to ask this question in Quad Related Problems, and get more input...
 
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