1973 evinrude 135

[aggie 01]

Hello everyone, I have a 1973 Evinrude 135hp motor. it will run fine with the cowl off, but if you put it on it dies. do ya have any idea of what it might be? thanks...

 

[ezeke]

Re: 1973 evinrude 135

Could be the spark plug wires are too close to the metal clamps on the cover; try moving the wires so that they are not in contact.

You could also be pulling exhaust into the engine compartment if the exhaust seals are not in place.

 

[Joe Reeves]

Re: 1973 evinrude 135

Usually caused by a engine that's breathing its own exhaust fumes.

 

[aggie 01]

Re: 1973 evinrude 135

so would that be because of the powerhead is shot?

 

[R.Johnson]

Re: 1973 evinrude 135

That engine had a lot of punch for it's time, and it was also rather light weight. I looked around quite some time before I found one. The trouble was, It was not unusual to go BANG. Start with a compression check.

 

[aggie 01]

Re: 1973 evinrude 135

do you know what the compression should be?

 

[ezeke]

Re: 1973 evinrude 135

Mine runs around 125-135 PSI at sea level.

The most common cause of the problem is the exhaust seal between the inner exhaust and the gearcase is misplaced or deteriorated.

 

[wilde1j]

Re: 1973 evinrude 135

Failure of the adapter gasket (#18) will put exhaust into the powerhead cover.