Carbon fouling my carbs?

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Twin Pinzies
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Carbon fouling my carbs?

Post by Twin Pinzies » Sun Apr 10, 2016 11:06 am

When I was swapping my main jets last summer, I noticed that the internals of my carbs were dark and sooty. I'm pretty sure that a carb in good condition should be clean and shiny since it should only deal with air and fuel.
Is this a symptom of bad piston rings?

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rmel
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Re: Carbon fouling my carbs?

Post by rmel » Sun Apr 10, 2016 12:10 pm

Any backfiring when starting or under any driving conditions?
Do you see any carbon deposits in the Air Intake hood Group # 1-35-15?
See anything in there might backfiring on you at times, if you do
might be a rich or bit too far advanced.
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Texas710
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Re: Carbon fouling my carbs?

Post by Texas710 » Sun Apr 10, 2016 8:07 pm

I was thinking timing as well.

What about a weak intake valve spring or possibly wearing valve seats...

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Jim LaGuardia
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Re: Carbon fouling my carbs?

Post by Jim LaGuardia » Sun Apr 10, 2016 10:12 pm

They all get dirty. Very normal, the crank case vents into the air box, the more blow by, the faster the sooty build up.
Cheers, Jim LaGuardia
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Twin Pinzies
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Re: Carbon fouling my carbs?

Post by Twin Pinzies » Sat Jul 09, 2016 10:32 am

Thanks for the replies guys.
Could it also have anything to do with 10% ethanol in my gas? A friend of mine said that his snowmobile did that when he started using ethanol gas.

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