77 25hp evinrude smoking

tdr9499

Cadet
Joined
Dec 16, 2003
Messages
29
Finally gotten motor running right after it has been sitting up for years. Backed it in water today and tested it. I have a couple of questions maybe someone can help me with? First, I noticed the motor smoking. (white smoke) I am running 50:1 mixture. I am wondering if it could a problem interally with the motor or steam. I have replaced the thermostat and impeller. but the block still feels hot. I can pour a hand full of water and it will not sizzle or steam. Second, while underway the telltale does not pee as hard as it does while the boat is sitting still. There still is a steady stream of water though. I am wondering if these is enough to cool the motor? Or if the motor is postioned lower enough in the water??
 

Hooty

Rear Admiral
Joined
Oct 2, 2001
Messages
4,496
Re: 77 25hp evinrude smoking

How hot does the head get? Can you put your fingertips on it for several seconds? <br /><br />c/6<br />Hooty
 

tdr9499

Cadet
Joined
Dec 16, 2003
Messages
29
Re: 77 25hp evinrude smoking

yes, but it is really hot. How hot and how much smoke are these older motors supposed to get
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: 77 25hp evinrude smoking

You should be able to hold a finger on the head for a couple of seconds without getting burned. Are you sure it's steam you are seeing? If it's cold out, you will see steam coming from the exhaust. If it's peeing OK and not overheating, then you should be good to go. Older motors will tend to put out more smoke because of wear over the years. But, on a side note, if it really is white smoke, check the plugs for a CLEAN one that may indicate water getting in a cylinder. Do a compression test to verify that the motor is stable and not ingesting water. A clean(New looking) plug is a sign of water getting into a cylinder. Are you sure the impeller key was installed correctly? Could be the reason it's fine at idle, but not at high speed. Let us know..
 

tdr9499

Cadet
Joined
Dec 16, 2003
Messages
29
Re: 77 25hp evinrude smoking

what is the correct way to install the impeller key. It just fits in the hole on the shaft , I thought. it is cold here so maybe that explains the smoke. what is the correct compression supposed to be
 
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