is it a Yamaha if so there is a little cover on the back bottom of the throttle base remove it to find a regular head screw that can b loosened or tightened as needed
That should do it, I adjusted mine a few times the first year. It's pretty stable now. It's on page 21 in my 150 Yamaha manual. Maybe yours is bad/stripped?? If yes, sounds like dealer time.
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