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My 1996 custom Striper with a 1999 two stroke 70hp Yamaha mounted four holes up spinning a 13"x17 Turbo propeller. At wide open throttle, motor trimmed down turning about 5800 rpm, I'm doing 34 mph. Motor trimmed up enough to start to get loose, motor turning 6000 rpm, I run about 40-42 depending on the wind and current if any. I'm not sure if I need to do some link and sync timing adjustments because I'm not seeing the performance that others claim to have out of this same set up. I hear others claim they average 45 mph.