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Message: <blockquote data-quote="jammess" data-source="post: 1317666" data-attributes="member: 89387"><p>All this is very interesting but you don't suppose those 4 throttle bodies are matched on a flow bench in which case maybe one should leave the throttle valve linkages alone especially if Yamaha says so?  If these TBs are matched on a flow bench they were clean at the time so all one should have to do is squirt some cat converter friendly carb cleaner in the TBs to restore to original matched condition.  Just maybe this is all you really have to do or should do for that matter.  The air bypass screws on a TB are really just fine adjustments while the TB valve adjustments are the course adjustments that are typically set at the factory on a flow bench to create a matched set and are not adjusted in the field.</p></blockquote><p></p>