need help

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John Patterson

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Jan 27, 2013
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need help I have a 2013 optimax 75 hp but it running at 45000 rpm and at full throttle I run it at 6000 to 8000 feet elevation I have a 13 1/4 x 19 pitch prop and boat runs about 32 mph the boat is a 175 txw and it takes a long time to plan out any thoughts thanks:eek:
 
2013 should be efi the computor should compensate for altitude.although regardless less air = less power. supercharged outboards are less likely to experience power loss @ higher altitude. i would try a 17 pitch prop and see if that helps
 

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