where's my evinrude

[Bohogin]

hello, i have a 1972 25 hp evinrude that runs pretty good but smokes like a freight train. anyone have an answer to whats causeing this.

 

[RPJS]

Re: where's my evinrude

Is it white or blue smoke?<br /><br />White smoke would indicate water in the cylinders possibly head gasket.<br /><br />Blue smoke would be to much or the wrong type of oil, or the motor is running rich.

 

[Bohogin]

Re: where's my evinrude

seems to be white . checked compression got 120 both cylinders hot and cold. thought that would indicate something else.

 

[Bohogin]

Re: where's my evinrude

i think i checked compression correctly. i installed compression gauge and pulled start cord 3 times. is this sufficient?

 

[RPJS]

Re: where's my evinrude

what do your plugs look like, are they very clean

 

[Bohogin]

Re: where's my evinrude

plugs look really clean and wet. cranked while ago and the smoke will choke ya like its fuel smoke. would water vapors be like this?

 

[fireman57]

Re: where's my evinrude

What gasil mix are you running? It should be 50:1. If you are running 24 or 16:1 it will smoke you out.

 

[Bohogin]

Re: where's my evinrude

running 50:1 fuel ratio. my 25 hp johnson does not smoke a lick.

 

[Mark42]

Re: where's my evinrude

It could be running on one cylinder. Change the plugs lately? Wires OK? <br /><br />That is the way my two cylinder 40 ran when one plug was bad. Lots of white-ish smoke for a while. New wires and plugs fixed that.

 

[Bohogin]

Re: where's my evinrude

new plugs . pulled head today looks good gasket did not give any indication of being blown. pulled exhaust cover no obvious problems there.

 

[fireman57]

Re: where's my evinrude

I hope you didn't reuse the head gasket. In your original post you said that it smokes like a freight train and now you said that it does not smoke a lick. Which is it? You should be running 87 octane gas at a 50:1 ratio with a good twc 2 cycle oil.

 

[Bohogin]

Re: where's my evinrude

i said my 1982 25 johnson doesn't smoke a lick. this is my 1972 25 evinrude. no i have not replaced head gasket yet.

 

[pfolmar]

Re: where's my evinrude

Hwy Bohogin,<br />Looks like we have a similar problem. My engine (1971) 18 HP also is smoking a good bit(white) but not so bad as you have described and I pulled the plugs on it. I found one very clean and one that had the typical 2 stroke look with a little bit of oil on it. Turns out I had a small fault in the head gasket letting just enough water in the bottom cylinder to keep it from firing. I also had unburned fuel coming out the exhaust. Do you have that? The engine was running on one cylinder so I am changing gasket, plugs and wires and hope to be seeing a great improvement soon.

 

[fireman57]

Re: where's my evinrude

Sorry about that, I didn't read it close enough.