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FJR Motorcycle Forums
Technical & Mechanical Problems
Cleaning Throttle Bodies
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<blockquote data-quote="HaulinAshe" data-source="post: 837146" data-attributes="member: 1875"><p>Lots of good theories about where the gunk is originating. I've not taken the time to study the phenomenon carefully enough to add much. What I do know is that bikes with the PAIR system capped early in life (&lt; 5,000 miles) DO NOT have as much crud accumulated on the butterflies as others. My '07 butterflies looked good at roughly 97,000 miles, after the PAIRectomy was performed at 67,000 odo. I suspect it's a combination of malfunctioning PAIR backwash, back-streaming or "intake bounce" as us rednecks call it, and in my particular case... oil from a re-usable air filter (which will NEVER happen again!).</p><p></p><p>It is surprising how stiff the throttle gets over time as that crud builds up. It's one of those things that slowly degrades to a point where you don't notice it until you twist someone else's throttle. IMHO that throttle body buildup is one of the major causes of so many off-idle, jerky throttle complaints.</p></blockquote><p></p>
[QUOTE="HaulinAshe, post: 837146, member: 1875"] Lots of good theories about where the gunk is originating. I've not taken the time to study the phenomenon carefully enough to add much. What I do know is that bikes with the PAIR system capped early in life (< 5,000 miles) DO NOT have as much crud accumulated on the butterflies as others. My '07 butterflies looked good at roughly 97,000 miles, after the PAIRectomy was performed at 67,000 odo. I suspect it's a combination of malfunctioning PAIR backwash, back-streaming or "intake bounce" as us rednecks call it, and in my particular case... oil from a re-usable air filter (which will NEVER happen again!). It is surprising how stiff the throttle gets over time as that crud builds up. It's one of those things that slowly degrades to a point where you don't notice it until you twist someone else's throttle. IMHO that throttle body buildup is one of the major causes of so many off-idle, jerky throttle complaints. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Cleaning Throttle Bodies
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