Maintenance & Technical > KX500 Original

Keep fouling plugs

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Brett:
Please help.
I went for  a ride few weeks ago and bike decided to foul plug while riding along track in fifth half throttle.  Managed to get it home (very scary as went road way and had to give it full throttle which would make it die and then randomly go full noise lifting front wheel)  I at first thought i had a blocked low speed jet but when i checked it was fine.  I checked reed petals they fine. 
What happens now i put a clean plug in start it ride 200m and it doesn't like any throttle and then it floods up.  I push it back (cursing) remove plug, wack another in and same thing. :x
I have chunks missing from shin due to slipping off kicker on numerous occasions and am right p***ed off.
What could it be cr**py ignition?  I did the old put the finger on plug while kicking and yes it really hurts.
I dropped the needle with no effect.
Thinking bout trying a ngk 7 plug and also leaning all jets back (although has been running great up untill now)
Its moments like these i wish i bought a 250.
Could someone give me a few ideas of what it could be and also what are the specs to check the coil and do rotor's demagnatise after a while? :?  Its a 91 model

Paul:
What plug are you using?

Brett:
I have been using a B8EGV but just then i tried a B7ES (cheapest cr*piest) and it did last longer but i cannot give it more than half throttle without spluttering.
I've checked the carby and nothing stuck in it and i refuse to believe the weather could just suddenly run piss poor.
Therefore im leaning to ignition so i need to know specs to check it.

hughes:
Float height? Have you checked it? Did bike run great until now?

alan:
Hughes is right, you have some other problems! The fowling plug is a just a symptom of the real problem. When did the problem start?
When I first got my KX5 I use to fowl plugs all the time and I think it was mostly my riding technique. I was bogging it down to much and also I was running to rich of oil mixture. What fixed my fowling problem was, I put a reed spacer on and an FMF Gnarly pipe, which vastly improved the mid range power. I found I could run one gear taller without fowling plugs. Also I think a 7 plug is to hot and you will end up wit some other problems. I run 8 & 9's mostly Iridium and Platinum's and I find they are much better for my style of riding.

If this isn't a new problem you really need to look at jetting and oil mixture. I am sure you will got lots more hints from the other members!

Alan :-D

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