Operating RPM Range for 1996 Johnson 90

[SummitPower]

I was wondering what is the operating RPM range for a 1996 Johnson 90 and where the peak HP should be? Presently I have a 21" pitch prop and I get about 4500 RPMs when trimmed up with the boat minimum loaded, I think this is about 500 rpm too low. Any comments?<br /><br />TIA

 

[kart33]

Re: Operating RPM Range for 1996 Johnson 90

Everything I have seen and read says 5000-5500 is WOT RPM.

 

[Dhadley]

Re: Operating RPM Range for 1996 Johnson 90

For maximum engine life, fuel economy and performance top RPM's should be at 5800 with an average load with your motor.<br /><br />Good luck!

 

[wilde1j]

Re: Operating RPM Range for 1996 Johnson 90

At least 1000 RPM too low. Probably a 15" pitch will get it close to right.

 

[Dhadley]

Re: Operating RPM Range for 1996 Johnson 90

You can also play with your X dimension to gain RPM. In doing so you may also improve holeshot and top speed.<br /><br />Before you do anything, look at the back of the tach and make sure it's set on position 6.....not 4.<br /><br />Good luck!