Maintenance & Technical > KX500 Original

Spark Plugs

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RoostDaddy:
just wondering what plug everyone is running in their k5.
I know some electrical systems on other bikes are sensitive and resistor type plugs are recommended, but never ran into this with the k5.
Also, is there any benefit to running the projected type plug, I've heard people claim they are easier firing?

monster malibu:
I'm running NGK B8EG's.

Mick:
I've used nothing but the cheap-O B8ES in my KX.  The only covet is to gap the plug on the tight side so it fires easy.
But if you want to know about projected noses I'll tell you my experience with them...they're awsome!  It's not a horsepower thing nor does it have anything to do with performance persae, but they sure do age well.  A typical plug in either of my 500s starts great and runs real clean off the bottom for several rides, and then begins to get fussy with starting and maybe flaming out at idle speeds after a dozen or so rides.  When it becomes habit that the motor backfires once or twice before it starts I change the plug and the cycle starts all over again.  I've used ONE projected nose tip plug in my life.  It's in my CR right now and has 24 rides on it plus or minus and starts just as effortlessly and chugs everybit as good as day numero uno.  More still is that while testing a new ignition at one time I was running stupid rich jetting that I'm sure would have put the kill shot on a B8ES or IX plug.  The BP8ES runs very clean.  Technically speaking it burns off carbon residue at low rpm that may otherwise foul a typical plug.  And yet at higher rpm is even capable of running cooler so as to mitigate pre det and plug melting.  Projected nose tip plugs are going to be the only kind I use from now on.

KXcam22:
I ran the cheapo BPR8ES (projected nose) plug for the 14 years I had my K5.  I order them from NAPA or Lorco.  Each one lasted a season and never fouled ever.  I heard that the EIX plugs make more power but never tried them in the K5. Cam.

Hillclimb#42:
Getting BR8ES for less than $2/plug from O'reily's Auto Parts. Am I missing out on power? They last a long time and the center electrode is not small like on some. The little pencil-lead size electrodes seem like they would oil or carbon foul faster. I learned that fast/wise people are paying attention to which direction the gap is facing in the cylinder. Open-side towards intake, I think, but there's always an exception to theory.

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