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Low Compression on one cylinder #13540894 04/30/20 10:48 PM
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plummer Offline OP
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Have been told I have low compression on one cylinder on a 25HP four stroke Mercury. What could cause this and can I continue to run the motor. Three were at 135 and one at 90.

Re: Low Compression on one cylinder [Re: plummer] #13540916 04/30/20 11:18 PM
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tmd11111 Online Content
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25hp 4 cylinder?

Re: Low Compression on one cylinder [Re: tmd11111] #13541003 05/01/20 12:42 AM
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plummer Offline OP
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Yes

Re: Low Compression on one cylinder [Re: plummer] #13557007 05/14/20 05:09 AM
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Larry Mosby Offline
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Blown gasket, burnt valve, bad rings


Larry Mosby
Re: Low Compression on one cylinder [Re: plummer] #13558604 05/15/20 12:51 PM
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texcajun Offline
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Originally Posted by plummer
Have been told I have low compression on one cylinder on a 25HP four stroke Mercury. What could cause this and can I continue to run the motor. Three were at 135 and one at 90.



Not if you have any hope of rebuilding it.


2002 Scandy White, 2002 Yamaha 90
Point me towards the water!
Re: Low Compression on one cylinder [Re: plummer] #13558616 05/15/20 01:02 PM
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boatman025 Offline
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We can do a leak down and possible tell you if it head issue.


Hughes Marine
3855 Osage Lane
Wylie ,Texas
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