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Old 03-07-2020, 13:48   #16
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Re: 1971 Evinrude won’t start. Need troubleshooting ideas

I had a fancy Mercury multi cylinder 2 stroke from probably earlier than yours. Well, my problem turned out to be the wiring on the engine. The rubber wiring insulation had cracked, moisture had got into the copper core and the actual conductor part had become powder......


It was so bad that the main positive couldnt pass enough current to turn the starter and the exact same thing was playing out to various degrees on all the other wiring on the engine. Of course nobody makes replacement parts for most of the bits concerned so mine was only good as a donor source for parts for someone elses engine.


Just unbelievable how expensive a simple 20-50hp outboard is today.....
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Old 03-07-2020, 17:34   #17
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Re: 1971 Evinrude won’t start. Need troubleshooting ideas

I wrote a letter taking over an hour to explain nicely about the roughness problems and it threw my letter away. If you want a professional opinion I will write it again.
In summery Mechanical noise is probably big end brg and crank pin ($50 about)
Too much fuel is second reason. (1)From possible fuel diaphragm crack. (2)Needle /seat not closing. (3) Idle jet screw too far open to cause low speed roughness.
(4) Roughness is richness and (5) smoothness and power is a nice lean engine.
(6) Wear a mask and save lives and your economy like we done here in Spain.
Cheers John.
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Old 03-07-2020, 17:40   #18
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Re: 1971 Evinrude won’t start. Need troubleshooting ideas

I have an old 2-stroke too, and my first thought when I read your first post was "take the carb apart." Now that you have and it's running rough, then yes I'd turn to mixture now, check #2,3, 4 of John's previous post.
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Old 03-09-2020, 03:13   #19
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Re: 1971 Evinrude won’t start. Need troubleshooting ideas

Looks like compression is the culprit. Engine revs to full rpms in neutral but in forward, barely runs at 5 knots. Possibly a cracked piston ring. Thanks for the input.
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Old 03-09-2020, 15:56   #20
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Re: 1971 Evinrude won’t start. Need troubleshooting ideas

Quote:
Originally Posted by Christiansailin View Post
Looks like compression is the culprit. Engine revs to full rpms in neutral but in forward, barely runs at 5 knots. Possibly a cracked piston ring. Thanks for the input.
Glad you posted back the results,
Doubt the ring is cracked unless it's power loss happened suddenly. At it's age more likely just plain worn out.
Are you going to junk it or rebuild it?
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Old 04-09-2020, 05:59   #21
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Re: 1971 Evinrude won’t start. Need troubleshooting ideas

The plan is to replace but I may keep the oldie and try my hand at repair
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