Foul Plug

Joined
Oct 20, 2000
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#1
Was out riding yesterday.The bike ran great.Then I let it sit for about an hour,while I took a break.After I restarted it,I went about 50 feet and she backfired,sputtered and quit.Put in a new plug and everything was back to normal.What happened?
One thought I had was that I left the petcock on while it was sitting.Could this be possible?
 

MADisher

Grand Data Poohbah
Joined
Apr 30, 2000
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#2
Just leaving the valve open shoudln't flood it unless your float is screwed up.

perhaps it was just time :) If you keep fouling then ya need to rejet. Has your weather or conditions changed recently ?
 
Joined
Jan 25, 2001
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#3
I agree with you both.

It is possible the float-jet has a slight leak which doesn’t manifest itself all the time but eventually the extra fuel that isn’t drained off the overflow (slightly blocked?) could trickle into the crankcase & when you start it is thrown at the plug. Once fouled plugs often don’t recover.
 
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Oct 20, 2000
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#4
The weather has changed a bit here.High 70's/low 80's with low humidity.I did remember that I let a friend ride it just before I parked it.He is kinda slow.Could be,it wasn't cleaned out enough before stopping.Right now my jetting is 140 main,42 pilot,clip 2nd from top,a/s 1 turn out.Stock pipe and silencer and air box lid removed. I was thinking about going to a 40 pilot.Also, changing my mixture to 50:1,instead of 64:1.
 
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