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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle Body Sync Photos
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<blockquote data-quote="Fred W" data-source="post: 1175238" data-attributes="member: 3828"><p>Yes, the Yamaha tech had it backwards. If you back out the air screw fully, and then only turn it in one turn from there, you will have way too much bypass air and, after balancing the 4 throttles your idle speed will be too high and unable to be adjusted down.</p><p></p><p>The correct way to do it is to run the air screws all the way in to lightly seated, then back each one out only 1 turn from there. Knock the high vacuums down (by opening that air screw) and/or raise the lowest ones by turning those air screws a bit.</p><p></p><p>The absolute vacuum pressure is inconsequential. It will be what ever it will be and these adjustments will not really alter that. All you wan t to do is to make all 4 throttles the same vacuum and have the idle speed at 1000-1100 rpm.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1175238, member: 3828"] Yes, the Yamaha tech had it backwards. If you back out the air screw fully, and then only turn it in one turn from there, you will have way too much bypass air and, after balancing the 4 throttles your idle speed will be too high and unable to be adjusted down. The correct way to do it is to run the air screws all the way in to lightly seated, then back each one out only 1 turn from there. Knock the high vacuums down (by opening that air screw) and/or raise the lowest ones by turning those air screws a bit. The absolute vacuum pressure is inconsequential. It will be what ever it will be and these adjustments will not really alter that. All you wan t to do is to make all 4 throttles the same vacuum and have the idle speed at 1000-1100 rpm. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle Body Sync Photos
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