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Old 07-09-2011, 03:21 AM   #1
chopperTony
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Default Spark plug problem

spart

Last edited by chopperTony; 07-14-2012 at 04:52 PM.
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Old 07-09-2011, 05:04 AM   #2
Unkl Ian
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Default Re: Spark plug problem

The problem is oil is getting in the cylinder.

Either past the rings, or valve guides.
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Old 07-09-2011, 05:33 AM   #3
carlinojoe
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Default Re: Spark plug problem

how is that fixed?
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Old 07-09-2011, 06:50 AM   #4
F.St.M.
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Default Re: Spark plug problem

Quote:
Originally Posted by chopperTony View Post
Is there a quick fix so it can run during the summer?

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Old 07-09-2011, 07:38 AM   #5
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Default Re: Spark plug problem

ChopperTony!

If you set the plug out in the warm sunlight for a while,
you can tell if it is really oil that stays greasy, or gas-fouled if it dries to soot.

Oil would mean a hardware problem, like a breached headgasket, worn rings, or damage around an intake valve guide, etc., as Unkl Ian mentioned.

But the far more common cause of fouling is fuel when there is a vacuum leak: The carb must be over-enrichened to make the lean cylinder run.

Please bubble-test your manifold assembly as discussed at http://virtualindian.org/11techleaktest.html.
(A #9 rubber stopper works as well as a testplate, but takes three hands.)

I would wager that you have a leak to your rear cylinder.

....Cotten
PS: With a Pan, it is also adviseable to bubble-test the pan cover screw over each intake port, as occasionally they have breached from too long of screws in the past.
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