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Do you still have the 15P Spitfire? I'm looking for a good used one if you still have it.This is what I got with a 90hp four stroke using the x7 15p, 38 mph 5500 rpm. I bought a 13p to replace it . getting 5750 rpm and 35.5 mph top speed. Always tested full tank of gas one person 240lbs. fully trimmed before blowing out.