3. INSPECTION/ADJUSTMENT UXV 500 Adjust by loosening the valve adjusting Wrench Thickness Gauge Valve Adjusting screw lock-nut and turning the adjusting screw until there is a slight drag on the thickness gauge. Valve clearance (when cold): IN.: 0.1 mm (0.004 in) EX.: 0.1 mm (0.004 in) Apply oil to the valve adjusting screw lock- nut threads and seating surface. Hold the adjusting screw and tighten the lock nut. Lock Nut Special tool: Valve adjusting wrench A120E00036 Torque: 0.9 kgf-m (9 N-m, 6.5 lbf-ft) After tightening the lock nut, recheck the valve clearance. Install the removed parts in the reverse order of removal. CARBURETOR IDLE SPEED The engine must be warm for accurate idle speed inspection and adjustment. Warm up the engine before this operation. Start the engine and connect a tachometer. Throttle Stop Screw Turn the throttle stop screw to obtain the specified idle speed. Idle Speed: 1500100 rpm When the engine misses or run erratic, adjust the pilot screw (refer to the "CARBURETOR DISASSEMBLY/INSPECTION/ ASSEMBLY" section in the chapter 5). 3-12