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| Author |
Message |
    
Jimdorn (Jimdorn)
| | Posted on Monday, July 15, 2002 - 11:53 pm: | 
|
At full throttle, the engine only produces 2800-3200 RPM. It runs smooth and doesn't appear to be missing. The problem started as an intermittent thing. I checked the linkage and the carbs are opening all the way. Fuel pump and fuel filter are my next likely candidates. Anyone have any other ideas or suspects?? |
sparky
| | Posted on Monday, July 15, 2002 - 11:58 pm: |
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A bad sparkplug ? Or no spark to one cylinder. |
Jon
| | Posted on Tuesday, July 16, 2002 - 12:12 pm: |
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Jimdorn,
I'm just a hack, but here's my 2 cents.. Replacing old plugs is never a bad idea, but I think if there was bad spark on one cylinder, the engine will not run smoothly at any RPM. Checking for weak spark across the board wouldn't be a bad idea though.. Assuming the compression is good on all cylinders (over 100 and within 15 PSI), my #1 suspect would be fuel. A clogged carb, weak fuel pump, or restriction in the line would be what I would look for.
Jon |
bamamil@att.net
| | Posted on Tuesday, July 16, 2002 - 10:50 pm: |
|
You can check for a carb problem by using a squirt spray bottle of gas and spraying it into each carb while you have someone drive the boat for you. If the engine picks up, you know that you have found the carb needing attention. |
Roy Bremner
| | Posted on Sunday, August 04, 2002 - 11:08 am: |
|
Hi jim I have a 50hp. 1985 merc I just fixed a problem that sounds like yours, it was a blocked exhaust.I found it to be a problem caused by cheap oil. You have to pull the head off, and clean the exhaust out. there is no thermostat in my engine so now I use top quality oil only to cut down on deposits. Good Luck!!! |
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