70 HP Evinrude Problems Need Help :)

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ANDREW SMITH

Seaman Apprentice
Joined
Sep 18, 2004
Messages
48
Re: 70 HP Evinrude Problems Need Help :)

Marauderk, is your vent open???. I've been there and done that. Also, clean plugs are not good, and they usually indicate a small amout of water entering the combustion chamber and steam cleaning the plug. Have you noticed any steam coming out with the exhaust? Could be a blown head gasket (easy to fix) or a blown exhaust gasket(s) (not easy to fix).
 
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Marauderk

Petty Officer 2nd Class
Joined
May 7, 2005
Messages
168
Re: 70 HP Evinrude Problems Need Help :)

:) the vent is open not that i have not forgot to open one in the past lol. <br /><br />Well the plugs are not clean clean as in steam cleaned :) i had my headgasket go in my 35 hp and know what to look for now on that lol. <br /><br />The motor ran great for about 5 min and slowly slowed down till it would run only at idle speeds then i did all the work to her and now it will go about half throttle before boggin badly.<br /><br />only thing i have not replaced or rebuilt on the engine is the coils and powerpack
 
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ANDREW SMITH

Seaman Apprentice
Joined
Sep 18, 2004
Messages
48
Re: 70 HP Evinrude Problems Need Help :)

Marauderk, is it hot? is your cooling system working? I sucked in a plastic bag last year and the engine bogged down without the warning horn going off...
 
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Marauderk

Petty Officer 2nd Class
Joined
May 7, 2005
Messages
168
Re: 70 HP Evinrude Problems Need Help :)

Motor does not seem to be getting to hot i can put my hand on the motor for quite a while without getting fried :) I have a friend that is going to lend me 3 new coils and a power pack to try and see if it's the problem. <br /><br />But i honestly am stumped on this one i have never had this much trouble getting an outboard to run lol. <br /><br />Thnak you to everyone that has tried to help <br /><br />Brian
 
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papasage

Senior Chief Petty Officer
Joined
Jan 12, 2003
Messages
785
Re: 70 HP Evinrude Problems Need Help :)

sounds like a coil heating up and start mising . have a 1974 70 hp that was doingbthat and replaced a coil that was cracked . ran like a dream .<br /> for sure you are loosing a cylinder . it might be firing but not strong enough to fire the plug under preasure .
 
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tr918

Petty Officer 2nd Class
Joined
Aug 15, 2004
Messages
153
Re: 70 HP Evinrude Problems Need Help :)

Marauderk, How did you make out on the coils and power pack? I am having similiar problems with my 65hp. I am curious to see what you found out? My coils were cracked so I replaced them. I can now get about half throttle out of it. Before I could not even get the bow in the air. Thanks.
 
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Marauderk

Petty Officer 2nd Class
Joined
May 7, 2005
Messages
168
Re: 70 HP Evinrude Problems Need Help :)

Just got the coils today so i am going to try and get them installed tonight and test it at the river if i can get it all done before dark. I will let you know just as soon as i can <br /><br />Thank's for the help everyone. <br /><br />Brian
 
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snwmobilecwboy

Recruit
Joined
May 29, 2005
Messages
1
Re: 70 HP Evinrude Problems Need Help :)

I am having the same problems with my 1975 70hp johnson. I've replaced all lines have good spark, tried several tanks and still get the problem after i run for about 5 minutes at wide open. Anything you find would be extremely helpful to me because I'm going nuts about this thing.
 
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Marauderk

Petty Officer 2nd Class
Joined
May 7, 2005
Messages
168
Re: 70 HP Evinrude Problems Need Help :)

Well florida weather has not let me get to the river to check her out as it has rained every day by the time i get off work and get home.<br /><br />will keep you posted when i can get it to the river
 
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BillP

Captain
Joined
Aug 10, 2002
Messages
3,290
Re: 70 HP Evinrude Problems Need Help :)

Did you replace the gaskets when cleaning the carbs? I had a similar problem from reusing the small o ring gasket inside the bowl. I bought new o rings earlier and they weren't in the bag when I got home to do the carbs, so I reused the old. It didn't run right and I ended up putting in new o rings later. That solved the problem.<br /><br />Another thing happened once after rebuilding omc carbs. The connector link popped out of the plastic keeper on the bottom carb. The motor ran but not good. You may want to check those links.
 
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Marauderk

Petty Officer 2nd Class
Joined
May 7, 2005
Messages
168
Re: 70 HP Evinrude Problems Need Help :)

i replace all gaskets that came in the kit i bought. i think the carbs are ok, i am thinking it's the coils but i have to get out to the water to find out and it's rains everytime i hook my boat up and then the sun shines the momnet i unhook it lol got to love florida weather
 
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Marauderk

Petty Officer 2nd Class
Joined
May 7, 2005
Messages
168
Re: 70 HP Evinrude Problems Need Help :)

OK looks like it was one of the coils getting hot and not putting out the right voltage replaced them and running like a champ. <br /><br />Thank you everyone for the help <br />Brian
 
fireman57

fireman57

Captain
Joined
Aug 24, 2004
Messages
3,811
Re: 70 HP Evinrude Problems Need Help :)

Great! Just as we suspected. Good fishing.
 
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