[Crf450xfarmer]

Bike has a high compression piston. Can't seem to get it to idle properly. It will idle low after I give it throttle but then slowly climb by itself and idle way to high. Backfires quite abit when you let off when riding

[Back2-2]

Sounds like an air leak on the intake side of the carb. Maybe the manifold / intake boot, carb body / slide, air screw ?
Use some starting fluid to spray around those areas and see if the idle jumps up. Might not hurt to check the air screw for the o-ring.