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#12445950 - 09/28/17 07:58 PM Mercury optimax 150 compression
bondsman Offline

Registered: 02/21/11
Posts: 26
Would some of you more expirenced folks know what the compression numbers should be
Thanks and God Bless

#12446457 - 09/29/17 08:03 AM Re: Mercury optimax 150 compression [Re: bondsman]
Muzzlebrake Offline
Extreme Angler

Registered: 12/26/14
Posts: 1664
Loc: Euless
A fresh strong engine would be in the 120-125 range cold cranking and all holes close to equal. 100-115 is OK and will still run out good. 80-90 and I would be thinking about freshening the power head up with honing and new rings. If one or more holes is 10-15 psi lower than the others I would keep a close eye on it and maybe add a little oil to the gas to supplement the auto oil mixing.
I ain't no guru and no warranty implied:)
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."

Then He made the earth round...and He laughed and laughed and laughed!

#12447684 - 09/30/17 09:17 AM Re: Mercury optimax 150 compression [Re: bondsman]
gary purdy Online   content
TFF Guru

Registered: 05/24/03
Posts: 11468
Loc: Littlefield Tx & Lake A. H. US...
120 to 130 You can get bogging and a poor hole shot under that.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD


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