Maintenance & Technical > KX500 Original
Spark Plugs
ToomanyKaws:
I have run the BR8ES and the BR8EG in my KX500. Seems to run the same on both plugs. Always have a spare 8 plug period in my camelback pack though. The one time I didn't and the only time my KX250 ever fouled a plug. The 500 been easy on plugs and have yet to foul one. Like having a fresh one in there though just to avoid the hassle of swapping out in the desert. KDX200 been on the same plug for three years. Afraid to touch it. Starts on the 2nd kick cold and 1st hot, all the time.
stock500:
I just changed to the BPR8ES and didn't notice any difference at all in performance, but it was sure time for a new plug.
gwcrim:
I run a reg'lar old B8ES. They actually last for years if you jet properly.
Mick:
--- Quote from: Sofus on April 19, 2009, 09:25:14 PM ---I just got a new BPR8ES after reading this thread.
Oh my god, what a difference that made! The bikes starts much better, and pulls wheelies in 2 and 3 as well.
--- End quote ---
Your old plug must have been worn pretty far beyond the limit to yield such a noticable gain...no spark plug IMO really provides any performance benefit over the next. I don't buy that iridium hype, I've tried them...no different than a B8ES.
But what does matter is plug gap! Especially on our 500s. Do understand that as a plug wears the electrode gap increases. As the gap increases and the electrode becomes more and more contaminated with carbon the ability for that spark to bridge the gap becomes increasingly more difficult. Now no spark plug I've EVER measured out of the box had the correct gap for my bike. They always have too much. And when going from a well carboned plug with a huge gap to a nice fresh plug with the correct gap then yes, there should be a seat of the pants boost in performance.
I've just been exceedingly pleased with the projected nose plugs because they seem to perform "like new, fresh out of the box" for a very long time.
bob larry:
--- Quote from: Mick on April 22, 2009, 12:58:00 PM ---
--- Quote from: Sofus on April 19, 2009, 09:25:14 PM ---I just got a new BPR8ES after reading this thread.
Oh my god, what a difference that made! The bikes starts much better, and pulls wheelies in 2 and 3 as well.
--- End quote ---
Your old plug must have been worn pretty far beyond the limit to yield such a noticable gain...no spark plug IMO really provides any performance benefit over the next. I don't buy that iridium hype, I've tried them...no different than a B8ES.
But what does matter is plug gap! Especially on our 500s. Do understand that as a plug wears the electrode gap increases. As the gap increases and the electrode becomes more and more contaminated with carbon the ability for that spark to bridge the gap becomes increasingly more difficult. Now no spark plug I've EVER measured out of the box had the correct gap for my bike. They always have too much. And when going from a well carboned plug with a huge gap to a nice fresh plug with the correct gap then yes, there should be a seat of the pants boost in performance.
I've just been exceedingly pleased with the projected nose plugs because they seem to perform "like new, fresh out of the box" for a very long time.
--- End quote ---
What do you gap your plugs at??
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