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  Prop-90hp/60degree on Montauk

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Author Topic:   Prop-90hp/60degree on Montauk
masbama posted 05-31-2002 11:13 AM ET (US)   Profile for masbama   Send Email to masbama  
For those who have this set up. What size/kind of prop are you running? With just me in my boat and on calm water I can go 45+mph @5200 RPM's with a 14by19 Aluminum. The max RPM's for this motor (2002 Johnson) is 4500 to 5500 so I am within that range. With a loaded boat I can get to 4900 RPM's. Is that OK? I went with a 19" pitch because a heard 17" pitch can over-rev.
masbama posted 05-31-2002 11:21 AM ET (US)     Profile for masbama  Send Email to masbama     
Did I just answer my own question?
whalerron posted 05-31-2002 12:41 PM ET (US)     Profile for whalerron  Send Email to whalerron     
I have a 2001 Johnson 90 on my 16'7" whaler and at about 5300 rpms, the boat does 43 mph as measured with a GPS. The dealer ran my boat with a 17" prop and the engine would overrev so he went to a 19. If you are hitting 5200, at least you are not overrevving and that is the major concern.
Bigshot posted 05-31-2002 01:25 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You are ok....try trimming the nell out of it until it cavitates or stops increasing speed on the GPS. You might be amazed. If going to a stainless do a 17" and have it cupped to make it approx. an 18". A 19" SS would be a dog.

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