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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle body sync
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<blockquote data-quote="jestal" data-source="post: 213841" data-attributes="member: 477"><p>You could do it either way I would say.... Since the idle air bleeds have little effect at 4000 it is not going to matter that much. Sooner or later you have to open the idle air bleeds up a specific amount (1/4 turn) to start the sync at true idle so opening each of them a specific/equal amount for starters is what is important. No real way to do that other than look at the number of turns or fractions there-of. I tended toward setting the off idle sync with the air bleeds open a set amount to include their contribution to airflow at part throttle (albeit a very small amount of flow) but there is certainly merit to doing it with the air bleeds completely closed. At the end of the day I doubt that it will matter due to the small flow at thru the bleeds at part throttle. The main thing is to get the sync correct at part throttle by adjusting the throttle linkage screws and putting some sort of dummy load on the engine (by disconnecting injectors to kill cylinders not being synced) so the throttle opening is representative of where you are riding at part throttle....THEN go back and set the idle sync ( the "normal" TBS procedure) using the air screws as they were designed.</p></blockquote><p></p>
[QUOTE="jestal, post: 213841, member: 477"] You could do it either way I would say.... Since the idle air bleeds have little effect at 4000 it is not going to matter that much. Sooner or later you have to open the idle air bleeds up a specific amount (1/4 turn) to start the sync at true idle so opening each of them a specific/equal amount for starters is what is important. No real way to do that other than look at the number of turns or fractions there-of. I tended toward setting the off idle sync with the air bleeds open a set amount to include their contribution to airflow at part throttle (albeit a very small amount of flow) but there is certainly merit to doing it with the air bleeds completely closed. At the end of the day I doubt that it will matter due to the small flow at thru the bleeds at part throttle. The main thing is to get the sync correct at part throttle by adjusting the throttle linkage screws and putting some sort of dummy load on the engine (by disconnecting injectors to kill cylinders not being synced) so the throttle opening is representative of where you are riding at part throttle....THEN go back and set the idle sync ( the "normal" TBS procedure) using the air screws as they were designed. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle body sync
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