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FJR Motorcycle Forums
Technical & Mechanical Problems
The Really, Definitely Completely Un-Authorized TBS
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<blockquote data-quote="ABQFJR" data-source="post: 1034533" data-attributes="member: 28422"><p>Hi Fred,</p><p></p><p>I see your point, and that's actually pretty much how I did it last time. But what inspired me to try it with the idle screw backed out is that on the Gen 2, the idle screw basically acts like a master air leak for idle, while the air screws on the throttle bodies are used to create four separate, secondary air leaks which can be balanced against the main idle adjuster's air leak. At least, that's the way the system seems to work. I noticed that, even with all the air screws closed, the bike would still idle, just at a lower RPM. That told me that the idle adjust screw was acting independently of the TB air screws. It was only after I backed out the idle screw that the bike wouldn't run. In that case, I theorized that backing out the idle screw all the way would maximize the effects of throttle plate sync on the balance at idle (or 1200, or 2000, or wherever you choose to lock the throttle). If there is no air leak allowed, you know the only air getting through is past the throttle plates, and you can balance them more accurately. <a href="https://www.fjrforum.com/forum/index.php?showtopic=24297" target="_blank">This</a> thread has some interesting discussion on the 2nd gen idle circuit and its various screws. I believe constant mesh's post (#3) has the correct explanation.</p><p></p><p>Ah, hell, I feel like I'm splitting hairs at this point. In all honesty, I really don't think all the time I've spent in the garage messing with balancing the throttle bodies has made much of a difference, one way or the other. If it has made a difference, it's an intangible one. The first sync I did back when I first got the bike - the "authorized" sync - did smooth out my bike's idle, but that's it.</p><p></p><p>In any case, thanks for your willingness to discuss this ad nauseum! <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/smile.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="ABQFJR, post: 1034533, member: 28422"] Hi Fred, I see your point, and that's actually pretty much how I did it last time. But what inspired me to try it with the idle screw backed out is that on the Gen 2, the idle screw basically acts like a master air leak for idle, while the air screws on the throttle bodies are used to create four separate, secondary air leaks which can be balanced against the main idle adjuster's air leak. At least, that's the way the system seems to work. I noticed that, even with all the air screws closed, the bike would still idle, just at a lower RPM. That told me that the idle adjust screw was acting independently of the TB air screws. It was only after I backed out the idle screw that the bike wouldn't run. In that case, I theorized that backing out the idle screw all the way would maximize the effects of throttle plate sync on the balance at idle (or 1200, or 2000, or wherever you choose to lock the throttle). If there is no air leak allowed, you know the only air getting through is past the throttle plates, and you can balance them more accurately. [URL="https://www.fjrforum.com/forum/index.php?showtopic=24297"]This[/URL] thread has some interesting discussion on the 2nd gen idle circuit and its various screws. I believe constant mesh's post (#3) has the correct explanation. Ah, hell, I feel like I'm splitting hairs at this point. In all honesty, I really don't think all the time I've spent in the garage messing with balancing the throttle bodies has made much of a difference, one way or the other. If it has made a difference, it's an intangible one. The first sync I did back when I first got the bike - the "authorized" sync - did smooth out my bike's idle, but that's it. In any case, thanks for your willingness to discuss this ad nauseum! [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/smile.png[/IMG] [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
The Really, Definitely Completely Un-Authorized TBS
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