Maintenance & Technical > KX500 Original

Spark plug?

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NastyNick:
I ran the NGK Iridium all last year.  Just replaced it yesterday, and I bought it at a local Champion store for $4 (compared to the local kawasaki dealer for $12!)

Sharc:
Pretty sure whatever you run it has to be the "R" (resistor) type...I use BR8EG, motor's jetted a little rich, haven't fouled a plug ever in the 2002 K5.

FastKX500:
Im not sure what jetting I have...but when i fouled it it was trail riding..i was hill climbing up this hill and hit this stump 2 times and stalled it 2 times, so thats why it fouled i guess...and  I use klotz racing oil (benoil) and i mix it to 5 gallons of gas, and shake well.

toddwunsch:
For 2003 stock plug is BR8EG.  Team Green runs B9EVX which is what I run in my bike.  If you think your bike is fowling plugs at idle / low speeds, you can try to lean it out with the air screw.  Try running it two turns out.  Stock is 1.5 I believe.  If that doesn't help, you may need to lean out the pilot jet.  The air screw and pilot jet apply to the bike from 0 to 1/8 throttle.  The needle clip and main jet apply to the bike from 1/8 to full throttle.  Take a look at this to view the stock settings -vs- what Team Green runs on their 500's.

www.kawasakisportscenter.com/2003_Jetting.htm

Also, Ty Davis sells a air screw that can be adjusted by hand instead of a small screw driver.  www.ziptyracing.com  You'll want either the Keihin short-reach or Keihin long-reach depending on what the distance is from the collar of the air screw and the top edge of the roller ball.  For $21, it's a nice way to quick adjust your carb while on the trail.


Todd

Rick:
Yup, a black plug is a definite sign of carb issues.  

I'm not a big fan of either the BR8ES or the BR8EG (nickel).  While both are fine standard duty plugs, you are riding a high performance machine.  Platinum has a higher melting point, and thus longer wear.  Iridium plugs have been all the rage, so I tried a couple.  Didn't like the performance as well as platinum.

With a properly jetted and tuned bike, you should notice a performance improvement when switching to a BR8EVX.  I know that Team Green recommends the BR9EVX to get the proper flame front, but I've just never taken the time to rejet my bike for a BR9EVX.  Just too lazy...

Rick

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