1987 Evinrude Normal Compression

[scott hamilton]

E175TXCUA. On cold engine. Engine had not run in over 10 years. Lubricated day before and turned once by hand to distribute on cylinder walls. I got 85-90 on all 6 cylinders. Is this within specs?

 

[Crosbyman]

likely to low for now but don't worry at least they are equal… just run it for a while feed it some decarb like POWER TUNE retest compression after a few hours . some would burn a can of SEAFOAM

change the impeller BEFORE running it if not………. who knows what will happen

 

[scott hamilton]

Exactly why I only ran for 30 seconds after carb rebuild. Thank you.

 

[Crosbyman]

30 sec dry run on a new impeller makes that a used impeller hope it was the old impeller

 

[racerone]

Run on 50:1 mix until you confirm that oil injection is working properly.

 

[scott hamilton]

30 sec dry run on a new impeller makes that a used impeller hope it was the old impeller

It was on muffs. But ya, haven't done pump yet.

 

[oldboat1]

^^All good advice. I don't like to use additives or cleaners unless special cases (Just 2-cycle at 50:1 will do the lubrication job, and could always squirt a little into the cylinders before firing if desired.) As suggested, if run dry for even 30 seconds, should change out the impeller -- also think some regular running could improve compression, as mentioned.

Carbs may need cleaning and kits. I would check fuel for water or other stuff before running to avoid contaminating carbs whether you have first cleaned the carbs or not. (Another reason why I don't like adding solvents to the fuel source before running -- can loosen up and transfer nasties from tank.)