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Old 02-26-2021, 11:43 PM   #13
Tinker
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Join Date: May 2010
Location: MN
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Default Re: New misfire - sticky valves?

Quote:
Originally Posted by 51 MERC-CT View Post
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.
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!!!

Last edited by Tinker; 02-27-2021 at 12:18 AM.
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