Quote:
Originally Posted by 51 MERC-CT
Take a peek into #7 plug hole, you may or may not be able to see something like this.
A burnt exhaust valve spotted after chasing the source of some of the same symptoms.
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Had one of these on my 36. Compression was around 30lbs, Bruce L thought that was high from the culprit picture valve. Replaced it with a nice gentleman's help here sending me a good used valve setup.
Exhaust valves are usually the culprit. They receive all the heat and carbon. But sometimes it's the intake valve being burnt from a lean situation. Usually you can figure that out, if it is firing (electrical solid) then it back fires or pops out the carb.
yes you can do a mmo dump down the carb from time to time. It will not hurt. Cheap. I do it just because, once a year as regular maintenance. Seems to work for me so far. I wouldn't say it if it didn't.
When I first read this, the
first thing I thought was electrical. But the compression test rules that out. Best of luck!!!