Thread: Proper motor height

I went to my local boat shop and they didn't have any DFI oil. I've heard there are substitutes but I'm scared of them.

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No sense in risking it

Today I ran the boat pretty hard. I hit 5150 rpm and 37.5 by the gps. At that range I noticed I lost some water pressure. So I'm guessing I'm at my upper limit on my jack and actually need to let it down some. I know some of you guys mentioned possibly changing props. This is the one that's on it Merc marine Laser II. Any suggestions? And thanks for your help this far.

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5150 max RPM is right at the bottom of manufacturer's spec. It will breath much easier (and last longer) if you prop it so that you are maxing out near the top of the range. Not much kills an outboard faster than lugging (too much prop).

Originally Posted by DoyleAlley

5150 max RPM is right at the bottom of manufacturer's spec. It will breath much easier (and last longer) if you prop it so that you are maxing out near the top of the range. Not much kills an outboard faster than lugging (too much prop).

I agree. Can you make a recommendation?

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Originally Posted by catchNgrease

I agree. Can you make a recommendation?

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Those Laser IIs are decent props. See if your dealer will loan you a 17P of the same diameter to see if it works. Many dealers keep loaner props to experiment with. 2" less pitch should get you an addition 400 or so RPMs.

Originally Posted by DoyleAlley

Those Laser IIs are decent props. See if your dealer will loan you a 17P of the same diameter to see if it works. Many dealers keep loaner props to experiment with. 2" less pitch should get you an addition 400 or so RPMs.

Won't that slow the boat down?

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