MERCURY COMPRESSION

[252SCH]

I HAVE A 1991 MERCURY 40 HP CLASSIC, I JUST DID A COMPRESSION TEST ON IT, CYLINDER 1 READ 130, 2- READ 130, 3- READ 125, AND 4- READ 120. CAN ANYONE TELL ME WHAT THIS MEANS, AND IF THIS HAS A LOT TO DO WITH WHY MY MOTOR RUNS FINE OUT OF THE WATER, BUT ONCE IN THE WATER IT DOES RUN NO BETTER THAN A 10 HP MOTOR.

 

[north40]

Re: MERCURY COMPRESSION

Your compression is OK. I would suggest a decarb, new plugs and carb rebuild and sync. Good luck.<br />Bob

 

[252SCH]

Re: MERCURY COMPRESSION

WHAT WOULD YOU SUGGEST AS FAR AS A DECARB, SEAFOAM?

 

[north40]

Re: MERCURY COMPRESSION

Seafoam!!!

 

[252SCH]

Re: MERCURY COMPRESSION

THANKYOU FOR YOUR HELP