In the bad old days you would fine tune the tickover with a screw driver, these days no idea.
You say the RPM is 1200 rpm when warm, then you say it settles down to 850 rpm after 5 minutes?
Sounds like it hasnt warmed up yet therefore tickover is 1200 rpm.
Is it a cable throttle or drive by wire?
Cable throttle you can adjust yourself, drive by wire you need a dealer ,unless you have all the right kit and know what you are doing.
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