68 Evinrude 55hp - Starts/runs great on muffs. Hard to start in water, then runs grea

northface

Seaman Apprentice
Joined
Apr 10, 2012
Messages
45
I have a an old 55hp Evinrude that I rebuilt (with much help from folks on this board). I've been running it all summer with a few minor hiccups. One was a sticking advanced timing rod. Unfortunately, I messed with carbs before figuring it out. After pulling the flywheel, cleaning up the points and fixing the advanced timing, it starts on muffs with a touch of the key. Cold/warm doesn't matter. But when I get in the water it's a bit more trouble. It starts initially with the choke. But then gives me hell ever after. Have to crank it a dozen times to get it to start. Smokes a bit for minute then runs great.

I've dug through these posts and read about adding a diode between power and starter. I do have a new power pack and coil. Could this be it or is carb adjustment more likely? Also, I've always run the mix a bit heavy on oil. First to break it in and then just overly cautious. Closer to 40/1 vs 50/1. Fouling plugs? Bet that's it, sitting here writing this got some old synopses firing....:facepalm:
 

fireman57

Captain
Joined
Aug 24, 2004
Messages
3,811
Re: 68 Evinrude 55hp - Starts/runs great on muffs. Hard to start in water, then runs

Make sure that you set your idle on the water. The backpressure makes a ton of difference. Stay around 50;1 because if you keep mixing it rich all summer you will end up with a 24:1 or richer mix which is really for breaking an engine in.
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 68 Evinrude 55hp - Starts/runs great on muffs. Hard to start in water, then runs

Just for the heck of it what's the compression on it ?? Will the spark jump a 3/8 " open air gap on a tester??
 

northface

Seaman Apprentice
Joined
Apr 10, 2012
Messages
45
Re: 68 Evinrude 55hp - Starts/runs great on muffs. Hard to start in water, then runs

I always mix the fuel in a separate gas can. So the mix should be consistent at 40/1. I'll try setting the idle on the water the next time I have someone to drive.

The compression was good after I rebuilt it. Haven't checked it since. Same for the spark jump. I guess it wouldn't hurt to recheck it. But it sure runs fine after I get it running. Even when motoring at low idle.
 

northface

Seaman Apprentice
Joined
Apr 10, 2012
Messages
45
Re: 68 Evinrude 55hp - Starts/runs great on muffs. Hard to start in water, then runs

Thought I'd come back and update in case someone comes across this thread with a similar issue. While getting the boat ready for the season I kept hearing a click when I tried to start it on the muffs. As with last year it fired right up since it wasn't in the water. But the click/snap sound got my attention. So I investigated much closer and found the the brand new coil I put in last year (183-2382 an OEM replacement) had 2 cracks on the top. I sealed them with several coats of wire rubber seal. Ran perfect in/out of the water. After 3 days running on the water it suddenly acted up again. The rubber seal was no adhered very well so I assumed it wasn't a permanent fix and ordered a new (original coil) I found on-line. Hoping this fixes it and something else didn't go bad.

Any ideas on why a new coil would crack like that?
 
Top