3. INSPECTION/ADJUSTMENT STRYKER 125/150 CHANGE INTERVAL Air Cleaner More frequent replacement is required if ridden in unusually dusty or rainy areas. · Do not clean the paper element with compressed air. · If the air cleaner is installed improperly, dust may be sucked into the cylinder directly to reduce the engine horse- power and affect engine service life. · Pay attention to the installation direction during reassembly. CYLINDER COMPRESSION Warm up the engine before compression test. Remove the spark plug and insert a compression gauge. Open the throttle valve fully and crank the engine with the starter motor or kick lever for 78 seconds to test the compression. Compression: DA25AA,B: 13kg/cm DA30AA,B: 16kg/cm If the compression is low, check for the following: Leaky valves Valve clearance too small Leaking cylinder head gasket Worn piston/cylinder Worn piston rings If the compression is high, it indicates that carbon deposits have accumulated on the combustion chamber and the piston head. 3-9