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FJR Motorcycle Forums
Technical & Mechanical Problems
Iridium plugs on an FJR?
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<blockquote data-quote="Warchild" data-source="post: 599134" data-attributes="member: 4"><p>While I fully understand and appreciate that there are complex engineering aspects with regard to our ignition systems, I let my actual, real-world experiences form my opinions of spark plug performance/longevity.</p><p></p><p>I can find no meaningful difference in plug performance between a new set of the garden-variety NGK copper plugs that came with my bike, and a new set of equivalent Irridums. If there is a difference, my highly-calibrated butt-dyno can not pick up on it.</p><p></p><p>But the tune here changes after around 10,000 miles, or so.</p><p></p><p>After 10K or so, the bike has a slight but noticeable decline in its pulling power on the copper NGKs, where the Iridiums are still pulling just as strong as the day they were installed. With the Iridiums, I don't start to detect the slight loss of "snort" until around 16K-17K, and I'll generally replace them before 20K.</p><p></p><p>In my experience and through direct observation, the Iridums are worth it primarily because of their longevity. A long spark plug life is quite valuable on bikes where it is a COMPLETE ass-pain to remove/replace plugs (such as the GTR1400, or the 2nd-generation Hayabusa). On bike like the FJR, where it is a relatively trivial exercise to replace plugs, I could go either way. Yet I use the Irridums on the FJR as well, which allows me to typically ride most of the summer without having to swap out plugs.</p><p></p><p>YMMV, etc.</p></blockquote><p></p>
[QUOTE="Warchild, post: 599134, member: 4"] While I fully understand and appreciate that there are complex engineering aspects with regard to our ignition systems, I let my actual, real-world experiences form my opinions of spark plug performance/longevity. I can find no meaningful difference in plug performance between a new set of the garden-variety NGK copper plugs that came with my bike, and a new set of equivalent Irridums. If there is a difference, my highly-calibrated butt-dyno can not pick up on it. But the tune here changes after around 10,000 miles, or so. After 10K or so, the bike has a slight but noticeable decline in its pulling power on the copper NGKs, where the Iridiums are still pulling just as strong as the day they were installed. With the Iridiums, I don't start to detect the slight loss of "snort" until around 16K-17K, and I'll generally replace them before 20K. In my experience and through direct observation, the Iridums are worth it primarily because of their longevity. A long spark plug life is quite valuable on bikes where it is a COMPLETE ass-pain to remove/replace plugs (such as the GTR1400, or the 2nd-generation Hayabusa). On bike like the FJR, where it is a relatively trivial exercise to replace plugs, I could go either way. Yet I use the Irridums on the FJR as well, which allows me to typically ride most of the summer without having to swap out plugs. YMMV, etc. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Iridium plugs on an FJR?
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