merc 850 compression question

[04whitetb]

on my merc 850 the compression is below 100 psi on each cyl. i just purchased it a week ago. does anybody know of a product i can squirt into the cyl's to loosen up the rings to get them to seal better to help raise the comp?thanks

 

[Chris1956]

Re: merc 850 compression question

If the compression numbers are within 10% of each other, the motor is fine. What were they exactly? BTW - how do you know your gauge is accurate?