Fast idle on the left side below the seatwhich adjusters?
That’s great much appreciated top man 👍It can get stuck.
Take off tank and airbox to access throttle bodies then remove fast idle to check operation.
Then check routing of throttle cables and check the cables allow for full closure.
Confirm fast idle is operating properly then refit fast idle.
Again check operation of fast idle. If all seems ok refit airbox and tank then start bike to check it all out.
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Have you downloaded the Workshop manual from Steve's site here.....