WOW what a differnce from the FMF to the esr. Its worth the extra money. Really seemed to rev I went from a stock 142 main and a stock 42 slow to a 155 main and a 48 piolit runs great at 25 deg. Is it normal for a new pipe to discolor a little gold on the first 3-5 inches? It did it with in the first 5 min of riding plug looks good for color


]1986 ATC 330R
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