How do you adjust a intake valve on a 1998 Yamaha big bear 350 4x4?

To adjust the intake valve on a 1998 Yamaha Big Bear 350 4x4, first ensure the engine is cold, then remove the valve cover. Use a feeler gauge to check the clearance between the valve stem and the rocker arm; the correct gap is typically around 0.10 mm (0.004 inches). If adjustment is needed, loosen the locknut on the rocker arm, turn the adjustment screw to achieve the desired clearance, and then re-tighten the locknut. Finally, recheck the clearance to ensure it's set correctly before replacing the valve cover.