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84 90hp low top speed

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jeremy mullins

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Im only getting about 27mph ou

Im only getting about 27mph out of my 84 90hp on a 16ft bass boat... Im not sure what pitch my prop is but it seems that my engine isnt ataining enough rpm.. any insight?
 
"Hi Jeremy,
if you've got

"Hi Jeremy,
if you've got a tacho revs should be 5000 - 5500 WOT with a average laden boat ( manual will tell you the exact RPM ). If not and motor runs well -Low RPM's = too much prop pitch
High RPM's ( possible cavitation too ) = not enough prop pitch.} Prop pitch is very important.
hope this helps,
Mal"
 
"Jeremy,
My 84 90HP is doi

"Jeremy,
My 84 90HP is doing 32 mph (per gps) with a 521 prop on an older 16.5' trihull (no tach) with 4 adults aboard. I feel I'm not hitting the rpms I should either but I need to get a compatible tach to know.
Manual says 4250 - 5250 rpm operating range. You should have an ID plate stating this on your engine. Compression should be 145 - 165 psi on all cylinders. Mine are low, all around 135 psi but consistent.
Hope this helps,
DS"
 
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