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Old 09 May 2014, 13:32   #1
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Rev Range for my outboard!!!

Hello all.

Just wondering if anyone knows the rev range for my 1988 mariner mercury 20hp 2stroke.
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Old 10 May 2014, 03:51   #2
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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.
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Old 10 May 2014, 05:46   #3
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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.
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Old 17 May 2014, 08:12   #4
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Any takers on my question please would be appreciated
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Old 17 May 2014, 12:37   #5
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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.
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Old 19 May 2014, 04:46   #6
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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.
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