1990 force 120hp RPM range

[Boat-ryder]

I tried searching but couldn't find the answer. What is the top end RPM that I shouldn't exceed? also at what RPM are these engines most efficient while running? thanks

 

[pnwboat]

Max is 5500 RPM per OEM specs. Most efficient RPM is dependent on what type of boat you have, hull shape, length, weight and propeller pitch etc.

Generally I find that around 4000 RPM's for cruising is a good compromise for fuel consumption vs speed for my set up with a 17 pitch prop. That's somewhere around 30 - 35 MPH on my boat. When I use a 19 pitch prop, the RPM's drop down by 200 - 300 RPM's to achieve the 30 - to 35 MPH, but it seems to use a little more gas.

 

[SkiDad]

i agree mine runs good fuel wise from 3500-4000 - will suck some gas if you approach 5000 for a long time.