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FJR Motorcycle Forums
Technical & Mechanical Problems
Dual Platinum Spark Plugs
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<blockquote data-quote="ionbeam" data-source="post: 1236800" data-attributes="member: 277"><p>Change them when they need changing <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/wink.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> In modern engines with modern ignition systems plugs don't go bad like a light switch, they slowly, very slowly degrade. I'm pretty sure based on engine feel and gas mileage you couldn't tell the difference between new plugs and 50k mile plugs. For the health of the ignition system (coils & wires in Gen I & Gen II engines) you should change plugs at some point but it is completely arbitrary. Every (throwing a dart at the dart board...) 27k miles would work, it's when you are already there for a valve adjustment. If your engine does show a long slow gas mileage decline the plugs may be one of the first things to get changed but I *really* doubt that in 27k miles that would happen without an additional problem like a plugged air filter or carbon buildup from lots of cold starts and short rides.</p><p></p><p>There is a big difference between <em>recommended</em> and required change intervals. The Gen 3 engine with direct ignition coils should be even easier on plugs as opposed to the older wasted spark system that double fired the plugs (once on ignition and once on exhaust).</p><p></p><p>Edit: I see Allen_C posted basically the same thing while I was typing.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 1236800, member: 277"] Change them when they need changing [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/wink.png[/IMG] In modern engines with modern ignition systems plugs don't go bad like a light switch, they slowly, very slowly degrade. I'm pretty sure based on engine feel and gas mileage you couldn't tell the difference between new plugs and 50k mile plugs. For the health of the ignition system (coils & wires in Gen I & Gen II engines) you should change plugs at some point but it is completely arbitrary. Every (throwing a dart at the dart board...) 27k miles would work, it's when you are already there for a valve adjustment. If your engine does show a long slow gas mileage decline the plugs may be one of the first things to get changed but I *really* doubt that in 27k miles that would happen without an additional problem like a plugged air filter or carbon buildup from lots of cold starts and short rides. There is a big difference between [I]recommended[/I] and required change intervals. The Gen 3 engine with direct ignition coils should be even easier on plugs as opposed to the older wasted spark system that double fired the plugs (once on ignition and once on exhaust). Edit: I see Allen_C posted basically the same thing while I was typing. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Dual Platinum Spark Plugs
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