does anybody know the diff between 9.9 and a 15hp evenrude,can you cut the head?and how much? bump up the timing?and how much?releive the exaust?i am rebulding for a guy for his inflateabel and he wants more power,i have ordered boyseen reeds for it and was wondering what else i could do to it.i am not familer whith this moter,thanks
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