KX Riders

Maintenance & Technical => KX500 Original => Topic started by: fullbore55 on October 25, 2007, 03:22:03 PM

Title: Changing mix ratio=fouling plugs?
Post by: fullbore55 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? :?

Title: Re: Changing mix ratio=fouling plugs?
Post by: BDI on October 25, 2007, 03:40:57 PM

Did it just sart doing it out of the blue?

Title: Re: Changing mix ratio=fouling plugs?
Post by: fullbore55 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...

Title: Re: Changing mix ratio=fouling plugs?
Post by: fullbore55 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.

Title: Re: Changing mix ratio=fouling plugs?
Post by: c-152 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.

Title: Re: Changing mix ratio=fouling plugs?
Post by: fullbore55 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. 

Title: Re: Changing mix ratio=fouling plugs?
Post by: kaw rider 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.

Title: Re: Changing mix ratio=fouling plugs?
Post by: fullbore55 on October 29, 2007, 03:49:07 PM

It should die out pretty quickly, I assume?