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#11713445 - 07/09/16 09:27 AM 200 Merc engine
Lazy Ike Offline
Outdoorsman

Registered: 03/09/16
Posts: 120
Loc: garland
Iam looking at boat, has a 200hp Merc . What should compression numbers be? Its a2000yr model. thanks for help.

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#11713516 - 07/09/16 10:24 AM Re: 200 Merc engine [Re: Lazy Ike]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10515
Loc: Littlefield Tx & Lake A. H. US...
Which 200? EFI, Optimax or what. Compression on all cylinders within 10% of each other is the general rule.
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“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11714789 - 07/10/16 08:35 AM Re: 200 Merc engine [Re: Lazy Ike]
Muzzlebrake Offline
Extreme Angler

Registered: 12/26/14
Posts: 1004
Loc: Euless
+- 5 psi between all cylinders and 120 psi cold cranking compression would be great.
Below 100 psi on any cylinder would concern me. If any two cylinders next to each other are both low might indicate a blown or leaking head gasket. My 2003 EFI 150 is still setting on 125 all holes. A 200hp merc should be about the same if it is a 2.5L v6 engine.
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#11714895 - 07/10/16 09:59 AM Re: 200 Merc engine [Re: gary purdy]
Lazy Ike Offline
Outdoorsman

Registered: 03/09/16
Posts: 120
Loc: garland
Tanks gary, don't think its efi, he said its a2000yr mod.

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#11714898 - 07/10/16 10:00 AM Re: 200 Merc engine [Re: Muzzlebrake]
Lazy Ike Offline
Outdoorsman

Registered: 03/09/16
Posts: 120
Loc: garland
Thanks, for reply Muzzlebrake,gonna check it out today.

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