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FJR Motorcycle Forums
Technical & Mechanical Problems
"advanced" Throttle Body Synchronization
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<blockquote data-quote="fjrinbc" data-source="post: 51" data-attributes="member: 21"><p>I have not seen the article you are referring to, but this 'advanced' throttle sync would be to adjust the positions of the throttle plates relative to each so that they all open equally and each cylinder produces the same amount of power. The 'normal' vacuum sync would have little to no effect at 4000 rpm or higher, as it uses a small passageway around the throttle valve and is for idle and low rpm smoothness.</p><p></p><p>It is entirely possible to do this adjustment and is probably a worthwhile thing to do. It can be time consuming. Anyone who used to own an older 4 cylinder bike and liked to do their own work has most probably done this to the carburetors.</p><p></p><p>For the record Yamaha recommends you do not touch this, but that should not stop you from trying. They put the ability to adjust in there for a reason, right? If you do go ahead and do it you will have to reset the idle vacuum sync, but I am sure you know this.</p><p></p><p>Len</p></blockquote><p></p>
[QUOTE="fjrinbc, post: 51, member: 21"] I have not seen the article you are referring to, but this 'advanced' throttle sync would be to adjust the positions of the throttle plates relative to each so that they all open equally and each cylinder produces the same amount of power. The 'normal' vacuum sync would have little to no effect at 4000 rpm or higher, as it uses a small passageway around the throttle valve and is for idle and low rpm smoothness. It is entirely possible to do this adjustment and is probably a worthwhile thing to do. It can be time consuming. Anyone who used to own an older 4 cylinder bike and liked to do their own work has most probably done this to the carburetors. For the record Yamaha recommends you do not touch this, but that should not stop you from trying. They put the ability to adjust in there for a reason, right? If you do go ahead and do it you will have to reset the idle vacuum sync, but I am sure you know this. Len [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
"advanced" Throttle Body Synchronization
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