I am an owner of two puches which had the same prob. of carbon fouling. No matter how lean the mixture was in new plugs were a weekly occurance (the people at the auto parts store were wondering what the hell was this kid doing buying a million L82C plugs). Getting very frusterated I finaly found the most likely sorce of my problems. On a hunch I took apart the air box on my Magnum and sure enough the metal part of my element was rusted out. My theory is, the clogged air filter was acting like a choke and sucking gas out of my jet like a straw. Since then I have took the element out, just to see if I would foul another plug but unfortunitly I have not yet ridden it enough to see but so far the color on the plug looks good.