Rev Range for my outboard!!!

[dave3235]

Hello all.

Just wondering if anyone knows the rev range for my 1988 mariner mercury 20hp 2stroke.

[uncle al]

The rev range would be in the service manual, but if that was me I would go with the rev range max 5,000 rpm to be on the safe side.

[dave3235]

Thanks for your reply!!

I should have said it different, whats the power band ie say 4,500 to 5,500 rpm any one know or have one.

[dave3235]

Any takers on my question please would be appreciated

[henryfreston]

I would suspect the rev limit to be around 5750-6000 rpm, you are looking for roughly 5500 rpm when correctly propped with lighter load.

[uncle al]

you need to go into your nearest dealer with your serial number, and get him to look in the correct service manual and the wide open throttle revs(W.O.T.) is the powerband you should be either proped to stay in that band, thats why I said 5,000 RPM would be ok.Dont forget if you prop with a full load in the boat, then the OBM will rev higher when it is carrying a lighter load.Also over reving will/could stress your engine, as will over proping and not reaching its W.O.T. as per factory specs.