You fella’s know hayabusa’s well, what would cause my 2004 to have surging idle??? Its all stock, & thus so far i have sync’d the throttle bodies, replaced both fuel filters, replaced spark plugs, replaced all of the vacuum lines, replaced intake boots (between tb’s & engine) & have made sure all sensor connections are good & clean, i’m at a loss on what to try next. Could the P.A.I.R system somehow be letting air in? Also has anyone had the o-rings fail within the throttle body assembly that could allow an air leak. This issue acts just like a vacuum leak. The bike runs perfect at every other RPM, this is an idle only issue with it.