Spark Plug Fowling

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Spark Plug Fowling

Postby steel_cow » Mon Apr 19, 2004 7:40 am

Hi all!

I have a question about spark plugs. It seems as though I am forever having to clean my spark plugs. After even only a day or two of plowing, enough carbon builds up that starting is either difficult or impossible. I reset my gap every time.

Any Ideas????

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Postby John *.?-!.* cub owner » Mon Apr 19, 2004 8:06 am

Don't know what plugs you are using, but I prefer the Cahmpion D21 plugs. They are a hotter heat range and don't seem to foul as much. Also in my personal opinion, using a mid range (silver) gas seems to also reduce fouling.
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Postby bob » Mon Apr 19, 2004 8:29 am

Try a hotter plug like John said and also the cub has no tstat to warm the engine in cooler weather. During the cool and cold month ( for snow plowing) I use a large garbage bag to block the grill to get the engine temp up. A couple clothes pins around the headlight post keep it in place. In winter I completly cover the grill and after alot of checking the coolant level it still has never reached the level it runs while mowing in the summer with the grill clear.
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Postby WKPoor » Mon Apr 19, 2004 9:32 am

I've had the same problem in the past. Can't say this will fix but ACDelco makes a hotter plug yet. P/N C87. Try that and high octane fuel.There still is a mystery here because some folks have the problem and some don't.
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Postby George Willer » Mon Apr 19, 2004 10:13 am

There still is a mystery here because some folks have the problem and some don't.

Too rich a mixture adds to the problem, as does extended idling. While the Cub's carburetor has no direct high speed mixture control, lowering the float level will have a leaning effect. A restriction in the air cleaner will also cause a rich mixture. Service the air cleaner!
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