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FJR Motorcycle Forums
Technical & Mechanical Problems
White screw- throttle body synchronization
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<blockquote data-quote="Fred W" data-source="post: 1391577" data-attributes="member: 3828"><p>Im assuming that you are talking about your 2016:</p><p></p><p>If so, the screw with the white dot was the one with the lowest vacuum when all four screws were initially closed (lightly seated) during their factory sync. That one was left fully seated and the others were opened slightly (which relives some vacuum) to match the low one. The idea was that they wanted to add the least possible amount of bypass air, so that the other circuits (ECU controlled cold and warm idle opening of the main butterflies) have the maximum possible range and effect.</p><p></p><p>To get back to factory settings, just lightly seat the one with the white dot, and the open the other three to make vacuums match.</p><p></p><p>That said, if you had all of the vacuums matched, that should have resulted in minimum vibration. What you are sensing may just be in your head. These engines do tend to be buzzy at certain rpm ranges, and the amount seems to vary as they age and break in. Since there isnt much we can do about it, I would encourage you to not worry, be happy, and ride on!</p></blockquote><p></p>
[QUOTE="Fred W, post: 1391577, member: 3828"] Im assuming that you are talking about your 2016: If so, the screw with the white dot was the one with the lowest vacuum when all four screws were initially closed (lightly seated) during their factory sync. That one was left fully seated and the others were opened slightly (which relives some vacuum) to match the low one. The idea was that they wanted to add the least possible amount of bypass air, so that the other circuits (ECU controlled cold and warm idle opening of the main butterflies) have the maximum possible range and effect. To get back to factory settings, just lightly seat the one with the white dot, and the open the other three to make vacuums match. That said, if you had all of the vacuums matched, that should have resulted in minimum vibration. What you are sensing may just be in your head. These engines do tend to be buzzy at certain rpm ranges, and the amount seems to vary as they age and break in. Since there isnt much we can do about it, I would encourage you to not worry, be happy, and ride on! [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
White screw- throttle body synchronization
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