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Join Date: Mar 2007
Location: NYC berbs
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Ideling carbs waiting for run

I just converted to PMO’s and at my first AX I fouled my plugs while ideling between runs, about 10 minutes. Is this unusual or is this life with carbs ? I was told I need to run the engine at 2,500 to prevent fouling.

Dog

Old 03-29-2019, 05:20 PM
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Tell us more about the engine. Stock or modified? Also details about the ignition.
Old 03-31-2019, 05:00 AM
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You don't need to run at 2500 to prevent fouling.

You might try a hotter plug, smaller idle jet, or adjusting the idle mixture a bit.

THese are not plug and play. Some fiddling will be required, probably annually.
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Old 03-31-2019, 01:05 PM
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1979 SC engine with Aluminum flywheel, max moritx 98mm piston & cylinders 9.3 to one compression, 964 cam grind, SSIs M&k 2 in 2 out muffler, with thunder city Harley baffles. 46 PMOs

Was running e3.46 plugs, I saw their heat range was equilivent to NGK 5, 6 and 7 plugs. I just installed NGK BPR 6ES have not run yet.
Old 04-01-2019, 01:17 PM
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One of the old sage old school mechanics heard my car go off line at today’s AX and he turned to a friend of mine and said that my idle jests were clogged. So hopefully I learned something today and will recognize clogged idle jets and that is my fix

Dog
Old 04-07-2019, 04:15 PM
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Fouling sounds more like too rich, and clogged idle jets sound like you'd be lean at idle?

Easy to take the jets out and look at them. I suppose they could be clogged, and still too rich.

How have you synchronized the carb barrels?

I suppose you have checked your float levels, since this is so easy to do with the PMOs?

And you know all your specs - idle and main sizes, air corrector size? Emulsion tube number (those are kind of voodoo).

Old 04-11-2019, 08:13 PM
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