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Compression Test on 225 #11159106 10/12/15 04:01 PM
Joined: May 2015
Posts: 776
bFROG5 Offline OP
Pro Angler
OP Offline
Pro Angler
Joined: May 2015
Posts: 776
What should the compression range be for a 225 merc?
Is 160 on all cylinders too high? 160 is what came back on a boat I've been looking at.

Last edited by bFROG5; 10/12/15 04:02 PM.

Matthew 4:19
Re: Compression Test on 225 [Re: bFROG5] #11159504 10/12/15 07:45 PM
Joined: Aug 2009
Posts: 2,408
D
dimitri Offline
Extreme Angler
Offline
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D
Joined: Aug 2009
Posts: 2,408
if its an efi it should be 90-110. not sure about others.


Marine Electronics Installation
[by appointment only in Azle, Texas]
Graphs, Trolling Motors & Battery Chargers
Re: Compression Test on 225 [Re: bFROG5] #11159514 10/12/15 07:51 PM
Joined: Nov 2007
Posts: 5,497
ssmith Offline
TFF Celebrity
Offline
TFF Celebrity
Joined: Nov 2007
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you need to check your gauge.

Re: Compression Test on 225 [Re: bFROG5] #11159814 10/12/15 09:57 PM
Joined: Oct 2006
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Ken A. Offline
Groovy
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Groovy
Joined: Oct 2006
Posts: 13,504
Sounds high unless the previous owner milled the heads. I would look for 110-125



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