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Author Topic: Changing mix ratio=fouling plugs?  (Read 1965 times)

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Offline fullbore55

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Changing mix ratio=fouling plugs?
« on: October 25, 2007, 03:22:03 PM »
Recently, I've switched from a 32:1 mix ratio to 40:1(kawi-chem).  In the tight stuff, I would load up, but would never completely foul my plugs.  Am I losing my mind or is it possible that the bike is running worse at 40:1?  I'm actually fouling plugs without any warning or ability to "open up" the bike.  I switched to the br8eix plugs and they appear to foul just as easy.  Has anyone experienced this? :?
« Last Edit: October 25, 2007, 03:25:03 PM by fullbore55 »
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Offline BDI

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Re: Changing mix ratio=fouling plugs?
« Reply #1 on: October 25, 2007, 03:40:57 PM »
Did it just sart doing it out of the blue?
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Offline fullbore55

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Re: Changing mix ratio=fouling plugs?
« Reply #2 on: October 25, 2007, 03:53:55 PM »
Yes, I thought that 40:1 would help from loading up.  Now I'm fouling plugs.  At 32:1, I wasn't fouling...
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Offline fullbore55

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Re: Changing mix ratio=fouling plugs?
« Reply #3 on: October 25, 2007, 04:00:10 PM »
I guess I could go back to 32:1 to see if there is an improvement, but this seems illogical.
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Offline c-152

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Re: Changing mix ratio=fouling plugs?
« Reply #4 on: October 25, 2007, 11:48:49 PM »
Did the temp change any before you made the change.  I know my bike did not like the change to cooler weather and would not start for me at all undtil I made some jetting changes.
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Offline fullbore55

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Re: Changing mix ratio=fouling plugs?
« Reply #5 on: October 26, 2007, 09:03:17 AM »
Nope, temperature was relatively the same.  I'm just thinking...My stock jetting was borderline rich at 32:1.  At 40:1, I would be slightly richer(air/fuel jetting) which would be even more exaggerated in the tight stuff.  Although, the bike did not load up from oil at 40:1, It may foul a plug from being too rich. 
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Offline kaw rider

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Re: Changing mix ratio=fouling plugs?
« Reply #6 on: October 26, 2007, 12:07:16 PM »
you might have fuel/oil in your crankcase. i would start the engine and get up to temp. and setting there idling turn off the gas and see how long it runs.
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Offline fullbore55

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Re: Changing mix ratio=fouling plugs?
« Reply #7 on: October 29, 2007, 03:49:07 PM »
It should die out pretty quickly, I assume?
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