To adjust the clutch free play, loosen the locknut and slowly turn the adjusting screw counterclockwise until you feel resistance. Then, turn the adjusting screw clockwise 1/4 turn and hold the adjusting screw while tightening the locknut.
If this don't get it adjusted exactly right, you may have to fine tune it by holding up on the shift lever. You want it to where it just barely stops moving when the shifter is being held up.
Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!
You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.