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Thread: Merc 200 Compression
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02-02-2025, 02:00 PM #1
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Merc 200 Compression
Why would a 1997 Merc 200hp have compression of about 110psi on all cylinders and a 1998 have about 125psi on all cylinders? Was there some porting change between the two years, or is that just a sign of wear on the lower one? Does it mean the higher one will run better and have more power?
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02-02-2025, 02:49 PM #2
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02-03-2025, 08:43 PM #3
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I didn't take the reading, but I bet it was taken cold. Would you trust buying a motor with 110psi like that?
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02-03-2025, 10:01 PM #4
we found over tha years its best ta have more than one gauge if ya don't have one thats proven (trust)... 110 on all tha holes of a motor thats that old, would take a chance on it myself for tha right money... jmo
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02-03-2025, 10:16 PM #5
I have a 2000 200 carb motor I just rebuilt. Has about 30 hours on it. It has 120 PSI. I also have a 2001 200EFI I have been working on. It has 108-110 on all. A leakdown test says only 3% loss. I would say 110 on all is good to take a chance for the right price.
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