3. INSPECTION/ADJUSTMENT UXV 500 CYLINDER COMPRESSION Warm up the engine before compression Compression Gauge test. Remove the spark plug. Insert a compression gauge. Open the throttle valve fully and push the starter button to test the compression. Cylinder compression: 15 kg/cm (1500 kPa, 213 psi) If the compression is low, check for the following: - Leaky valves - Valve clearance too small - Leaking cylinder head gasket - Worn piston rings - Worn piston/cylinder If the compression is high, it indicates that carbon deposits have accumulated on the combustion chamber and the piston head. Upper Level ENGINE OIL OIL LEVEL Place the machine on a level place. Warm up the engine for several minutes and stop it. Run the engine for 23 minutes and check the oil level after the engine is stopped for 23 minutes. Lower Level Inspection Window Check the oil level through the inspection window. The oil level should be between the maximum (H) and minimum (L) marks. If the level is low, add oil to raise it to the proper level. Recommended engine oil: KYMCO 4-stroke oil or equivalent motor oil API service classification: SJ Viscosity: SAE 5W50 Other viscosities shown in the chart may be used when the average temperature in your riding area is within the indicated range. 3-13