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14-11-2015, 02:26
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#1
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Registered User
Join Date: Nov 2015
Posts: 5
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Smoke from old Evinrude 10hp outboard engine
Dear cruisers,
I have purchased a Waarschip 725 with an old (> 30 years) Evinrude 10hp outboard engine. During a trip last week, the engine was smoking quite a lote - even after having it running for more than an hour (please see attached video).
My question is now, is this something serious or possibly just too much oil? Can I still use it or does it need to get repaired urgently?
Many thanks and all the best
Christoph
PS: The engine was maintained recently in a boat shop.
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14-11-2015, 04:37
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#2
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,082
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Re: Smoke from old Evinrude 10hp outboard engine
Greetings and welcome aboard the CF, Christoph.
As you suspect, my first guess would be oil/fuel ratio too high.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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14-11-2015, 04:59
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#3
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Registered User
Join Date: Dec 2009
Boat: JBW club 420, MFG Bandit, Snark
Posts: 871
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Re: Smoke from old Evinrude 10hp outboard engine
How old was the oil/fuel mixture? It may have been the proper ratio but some gas evaporated leaving behind a bit too much oil.
Sent from my XT1080 using Cruisers Sailing Forum mobile app
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I love big boats and I can not lie.
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14-11-2015, 07:23
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#4
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Registered User
Join Date: Nov 2015
Posts: 5
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Re: Smoke from old Evinrude 10hp outboard engine
Thank you for the quick answers!
The mixture is about 3 months old.
You don't think that the smoke is water that condensates, right?
I will try and add more petrol as a starting point
Many thanks again!
Christoph
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14-11-2015, 09:02
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#5
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Registered User
Join Date: Feb 2015
Location: Caribbean
Boat: Beneteau 50
Posts: 45
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Re: Smoke from old Evinrude 10hp outboard engine
Quote:
Originally Posted by snapshotdiaries
Thank you for the quick answers!
The mixture is about 3 months old.
You don't think that the smoke is water that condensates, right?
I will try and add more petrol as a starting point
Many thanks again!
Christoph
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Best thing to do is dispose of the old fuel and mix a fresh measured petrol/oil ratio batch for that type of outboard 50:1 or 100:1, check manufacturers specs and throw in a new set of plugs and hopefully this will resolve the issue?
Fuels cheap enough these days Good luck
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Kind Regards
Peter - If it can't be fixed with a hammer it must be an electrical problem
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14-11-2015, 09:04
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#6
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Registered User
Join Date: Dec 2009
Boat: JBW club 420, MFG Bandit, Snark
Posts: 871
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Re: Smoke from old Evinrude 10hp outboard engine
I haven't seen the video. I would mix new stuff. That way you're sure of the ratio.
Two strokes smoke. I haven't seen the video so I can't tell you if I think it is excessive. I'm reading this thread on my phone.
Sent from my XT1080 using Cruisers Sailing Forum mobile app
__________________
I love big boats and I can not lie.
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14-11-2015, 09:05
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#7
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Registered User
Join Date: Jun 2013
Posts: 129
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Re: Smoke from old Evinrude 10hp outboard engine
Snapshot
I was unable to open the video. Water condensate would be steam. Looks like water is flowing through.
If smoke is bluish color then oil mixture problem as stated above is likely correct. I would dump the old fuel and start with a tank of fresh with the proper oil mix and see if that solves the problem. Check the spark plugs to see if they are fouled or excessively oily. Whith a lot of hours running time, the rings could be allowing blowby.
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14-11-2015, 09:13
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#8
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Registered User
Join Date: Oct 2009
Location: Brockville,Ont.
Boat: Mirage 25 "Garfield"
Posts: 137
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Re: Smoke from old Evinrude 10hp outboard engine
White smoke is water getting into combustion chamber(bad head gasket).
Blue smoke is too much oil.
If compression is good the rings should be ok,just replace fuel with proper mixture or run the old stuff through the motor.Too much oil won't hurt the engine other than fouling the plugs a bit.
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14-11-2015, 09:15
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#9
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,453
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Re: Smoke from old Evinrude 10hp outboard engine
Old fuel with maybe too much oil is a definite possibility. First step: Get all fuel out of it and put fresh mix in and see what happens.
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"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
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14-11-2015, 09:34
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#10
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Registered User
Join Date: Jul 2013
Location: Arizona
Boat: Looking
Posts: 74
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Re: Smoke from old Evinrude 10hp outboard engine
Along with all of the suggestions, run the motor with a load up to temp and it will probably clear-out. The older carb engines like to smoke when it is first started
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14-11-2015, 11:49
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#11
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Registered User
Join Date: Mar 2015
Posts: 971
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Re: Smoke from old Evinrude 10hp outboard engine
In the 70s fuel/oil ratio was 25 to 1. Then in the
80's 50 to 1. Recent 100 to 1.
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14-11-2015, 12:03
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#12
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Registered User
Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore"
Posts: 7,557
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Re: Smoke from old Evinrude 10hp outboard engine
Quote:
Originally Posted by Scaramanga F25
In the 70s fuel/oil ratio was 25 to 1. Then in the
80's 50 to 1. Recent 100 to 1.
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Since 1964 the mixture has been 50:1
Top 20 FAQ's about Outboards | Evinrude Nation Community
__________________
Rick I
Toronto in summer, Bahamas in winter.
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14-11-2015, 12:10
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#13
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Registered User
Join Date: Sep 2015
Location: Ontario
Boat: Kolibri 12'sloop
Posts: 14
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Re: Smoke from old Evinrude 10hp outboard engine
Modern oil allows a much leaner mix ratios than originaly recommended for your outboard.I use 50/1 in my 70 ish 6hp evinrude smokes less
Then when it was new.
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14-11-2015, 12:19
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#14
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Registered User
Join Date: Jul 2013
Location: Long Beach, CA
Boat: C&C Mk 1 33'
Posts: 67
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Re: Smoke from old Evinrude 10hp outboard engine
If it gives off blue smoke and smells like oil, too much oil in the gas mixture.
IF it smells sweet, the carb. needs to be adjusted to run a little leaner. Lean it out until it runs fastest for the throttle settings, then richen it until it starts to fall off.
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14-11-2015, 12:55
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#15
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Registered User
Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 10,208
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Re: Smoke from old Evinrude 10hp outboard engine
Just reading threw the replies. Dump the gas and start from scratch. If it is black smoke live with it, if that does not fix it. I would not put much money into an engine that old. The upper crank bearing will probably fail on an OMC. Shop time is expensive.
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