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FJR Motorcycle Forums
Technical & Mechanical Problems
2015 First TBS - what the...?
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<blockquote data-quote="Fred W" data-source="post: 1325439" data-attributes="member: 3828"><p>Yamaha takes the one with the least <em>vacuum </em>(with all 4 air screws fully closed) and marks that one as the reference and opens the other 3 to match it. Increasing air flow will lower vacuum.</p><p></p><p>The idea here is to only open the air screws as much as it takes to get the 4 vacuums balanced. That way, the majority of the air is going through the throttle bodies giving the ECU the max range of adjustment for the automagic idle speed. It is quite likely that Bob's just had two cylinders with the same amount of low vacuum.</p><p></p><p>If for some reason one of the 4 ports measured a lower vacuum than the one marked as reference, I would make that one be the one that is all the way closed and adjust the other three to it, ignoring the factory paint dot. You just want all 4 to be balanced, and opened as little as possible.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1325439, member: 3828"] Yamaha takes the one with the least [I]vacuum [/I](with all 4 air screws fully closed) and marks that one as the reference and opens the other 3 to match it. Increasing air flow will lower vacuum. The idea here is to only open the air screws as much as it takes to get the 4 vacuums balanced. That way, the majority of the air is going through the throttle bodies giving the ECU the max range of adjustment for the automagic idle speed. It is quite likely that Bob's just had two cylinders with the same amount of low vacuum. If for some reason one of the 4 ports measured a lower vacuum than the one marked as reference, I would make that one be the one that is all the way closed and adjust the other three to it, ignoring the factory paint dot. You just want all 4 to be balanced, and opened as little as possible. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
2015 First TBS - what the...?
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