Yfz450 CARB MODEL half throttle stutter. *READ DESCRIPTION*

So I start the bike you know and let it warm up and go to drive it right. But, after like 10 minutes of riding it starts doing this stuttering thing about half throttle and when I really get on it it clears up nice. That’s not the only thing. If that’s happening and I turn the quad off and start it back up that also clears it up and it runs amazing for the next 10 minutes and then does it again. Maybe tuning? Maybe spark plug cilinoid? I’m confused. Maybe some help you be nice from a yfz expert. Thanks.