Compression Results 45 HP Merc

[My Limit]

I've got a mid 80's Mercury that says 45 HP, but is called the "Classic Fifty". It has 4 cylinders. It runs great. I just want to see if anyone can let me know if these compression numbers sound ok.<br /><br />1. 130<br />2. 125<br />3. 120<br />4. 130<br /><br />Thanks

 

[dakk1]

Re: Compression Results 45 HP Merc

Looks good. 120 might be just a shade low but wouldn't bother me if, as you say, "It runs great." <br /><br />Dave..

 

[timmathis]

Re: Compression Results 45 HP Merc

You could try a good decarb it may help bring it up some. I have seen it help in many cases. Use Mercury powertune, deep-creep or ringfree. Run some through it(Spray carbs)while running. Pull plugs and treat all pistons/Rings and let it set overnight. See decarbing in FAQ. Tim

 

[My Limit]

Re: Compression Results 45 HP Merc

Thanks