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Force 85 HP Top Speed

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HHS Kid

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I have a 1986 Bayliner 16.5&#3

I have a 1986 Bayliner 16.5' with a 1986 Force 85 HP engine. Prop is 13.5" 17 Pitch. My top speed at WOT is about 25 MPH and pushing 5-5200 RPM. This seems slow to me. Shouldn't it be up in the 30-35 MPH range? I can push up to 6000 RPM but not much more speed and that many RPM is in the danger zone.

The speedo is a brand new gauge. And I got the same result with different load capacities in the boat.

Any help would be great.
 
"I'm confused. You say spe

"I'm confused. You say speed is 25mph @ WOT/5200 rpm, yet you can push it to 6000rpm. Therefore you haven't reached WOT at 5200 RPM, right? WOT == wide open throttle, not top speed.

The fact that you can get your motor above the redline says your prop is pitched too low. See if you can borrow a 19" pitch."
 
I see what you are saying. I

I see what you are saying. I did not want to push it over 5500 rpm for fear of doing any damage. Should I not be topping out at about 30-35 MPH? would the prop have something to do with that?
 
"17X17 is what you want. About

"17X17 is what you want. About 38 on speedo w/mine. This is what the local dealer said it came with. They also said 15X17 if pulling a waterskier, bigger hole-shot, and more "push" to compensate for the added drag."
 
"I have a 1987 Bayliner Trophy

"I have a 1987 Bayliner Trophy 1710 Fish & Ski with the 85 HP Force 3 cylinder outboard. This is different hull/boat design than that on the Bayliner Capri. I have the original motor and boat manuals which call for a 13 X 19 prop. I see 38 to 44 mph under different loaded conditions at WOT.

Here is a site listing different diameter & pitch combos for this year & size motor:
http://www.piranha.com/enginelist.php?manufacturer=Force&year=1987&HP=85.0&submi t.x=43&submit.y=12"
 
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