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Author Topic: 8hp evinrude max rpm's  (Read 2704 times)

Gambler

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8hp evinrude max rpm's
« on: Jul 26, 2009, 09:02 AM »
I have a 1987 evinrude 8hp. I don't have an owners manual for it. I want to know what the W.O.T. rpm's should be. I can only assume somewhere around 4500 but would like to know for sure.
Thanks for any replies!!
Take Care and God Bless!

Rick

Gambler

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Re: 8hp evinrude max rpm's
« Reply #1 on: Jul 30, 2009, 04:00 PM »
I can't believe that I am the only one on MFF that has a 1987 8hp evinrude.
Take Care and God Bless!

Rick

Chucker

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Re: 8hp evinrude max rpm's
« Reply #2 on: Jul 30, 2009, 06:07 PM »
You might be, but I have the Seloc book.   ;)  5500 RPM for you.

Gambler

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Re: 8hp evinrude max rpm's
« Reply #3 on: Jul 30, 2009, 09:59 PM »
Thanks man!!!!!
BTW, what is the seloc book???
Take Care and God Bless!

Rick

Chucker

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Re: 8hp evinrude max rpm's
« Reply #4 on: Jul 31, 2009, 08:04 AM »
http://www.selocmarine.com/

They're like a Haynes book for cars, but cover multiple model years for each of the major makers.  Mine is the Johnson / Evinrude Outboard 1971-89 1 - 2 cylinder book.  It covers our old 1974 4HP Evinrude as well as the 1980 4.5 HP I just picked up, as well as any other 1.5HP to 60HP engine made during those years.  They run about $30-35.

brokenline

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Re: 8hp evinrude max rpm's
« Reply #5 on: Jul 31, 2009, 08:48 AM »
is it pushing the boat in your pic? i doubt its actually running 5500 give or take 200 rpms.. my duck boat motor which was a 5 hp would only run 4 k and my chrystler runs 6 k... they are both stated for 5500..
still waiting on free willy

Gambler

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Re: 8hp evinrude max rpm's
« Reply #6 on: Jul 31, 2009, 11:17 AM »
is it pushing the boat in your pic? i doubt its actually running 5500 give or take 200 rpms.. my duck boat motor which was a 5 hp would only run 4 k and my chrystler runs 6 k... they are both stated for 5500..


Yes it is pushing the boat in my pic.
The reason for trying to find out what rpm's should be is because mine is only running 3800. If it was supposed to run at 4000 I would leave it alone. But when it should be 5500 I may try a lower pitch prop to help it gain more rpm's although I still can't see it getting near 5000.
I have read it is not good to run an outboard slower or faster than its intended rpm's. But I will bet mine has ran its entire life at way slower rpm's.
Take Care and God Bless!

Rick

brokenline

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Re: 8hp evinrude max rpm's
« Reply #7 on: Jul 31, 2009, 05:37 PM »
2 strokes dont like to be bogged or reved to high.. 3000 sounds kinda low.. ever try shifting the wieght in the boat? for me the battery up front will make it go from 5 to 12  with just me.
still waiting on free willy

brokenline

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Re: 8hp evinrude max rpm's
« Reply #8 on: Jul 31, 2009, 05:39 PM »
you will also notice better fuel econmy if its running the right rpms..
still waiting on free willy

Gambler

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Re: 8hp evinrude max rpm's
« Reply #9 on: Aug 08, 2009, 05:03 PM »
Well I got my new prop and I am totally amazed.
My rpm's went from 3800 to 5700. I never thought a 2" lower pitch would change it that much. I also gained 3mph. Now I can cruise at a blistering 13 mph  :laugh:.
Take Care and God Bless!

Rick

BBK

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Re: 8hp evinrude max rpm's
« Reply #10 on: Aug 08, 2009, 06:11 PM »
2 strokes dont like to be bogged or reved to high.. 3000 sounds kinda low.. ever try shifting the wieght in the boat? for me the battery up front will make it go from 5 to 12  with just me.

Why would shifting the weight gain rpms?

brokenline

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Re: 8hp evinrude max rpm's
« Reply #11 on: Aug 08, 2009, 06:23 PM »
most small boats with one person will ride with the bow up and create large ammounts of drag pushing the bow down and on plane will create less drag which allows the motor to run faster..
still waiting on free willy

Crappie Catcher

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Re: 8hp evinrude max rpm's
« Reply #12 on: Aug 08, 2009, 10:43 PM »
most small boats with one person will ride with the bow up and create large ammounts of drag pushing the bow down and on plane will create less drag which allows the motor to run faster..
Amen.  :flag:
If I'm not fishing, I'm hunting if I am not hunting, I'm trapping If I am not doing one of the above, I am wasting my time it is not a passion it is an obsession.

brokenline

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Re: 8hp evinrude max rpm's
« Reply #13 on: Aug 08, 2009, 10:44 PM »
P.S i used spell checker..
still waiting on free willy

 



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