3 cyl Evinrude carries one when cold

[SusQRiverRat]

I have an 82 75 hp Evinrude 3 cylinder.<br />It is a great motor, but has developed a perplexing problem.<br />When first started it seems to be carrying a cylinder until it warms up. It idles fine and starts with no difficulty. It takes about 2-3 minutes until the other cyl. kicks in. It starts hitting intermittently, and then all of a sudden goes like gangbusters.<br />It runs like a top the rest of the day<br />Visual inspection reveals nothing out of the ordinary, and since it's on a pontoon, trying to diagnose it on the boat, underway, is difficult at best.<br />I'm thinking a bad coil, but before I start throwing parts at it, any suggestions from y'all?<br /><br />Thanks,<br />Cliff

 

[rwise]

Re: 3 cyl Evinrude carries one when cold

sound to me like a plug fouling out, then when it warms up starting to fire. Just a thought.<br /><br />And welcome to I- Boats!

 

[ED21]

Re: 3 cyl Evinrude carries one when cold

I think coils usually quit when they get hot, not when they are cold.<br />I agree new plugs would be a 1st step.

 

[SusQRiverRat]

Re: 3 cyl Evinrude carries one when cold

Thanks rwise and Ed<br />I cleaned and gapped the plugs, they didn't look too bad.<br />I'll replace them and give it another try.

 

[ED21]

Re: 3 cyl Evinrude carries one when cold

Just a thought, I'm not a mechanic, but I often hear about 3 cyl. Evin./John. burning a piston because of running lean on one cylinder.<br />Could that cylinder be so lean that it isn't firing until it warms up a bit.<br />A visual check of plug should give some info.