MAINTENANCE Engine Breather Hose Inspection A smooth idle generally indicates good compression. Low engine compression is rarely a factor in running condition problems above idle speed. The engine is equipped with a breather hose. Inspect the breather hose for possible kinks or wear. The hose is form fit- ted for a proper fit. Follow the breather hose from the side of the airbox to the engine valve cover. A cylinder leakdown test is the best indication of engine condition. Follow manufacturer's instructions to perform a cylinder leakage test (never use high pressure leakage testers, as crankshaft seals may dislodge and leak). Breather Hose Cylinder Compression Standard:
150-200 PSI Cylinder Leakdown Service Limit 15% (Inspect for cause if test exceeds 15%) Exhaust - Spark Arrestor WARNING Do not clean spark arrestor immediately after the engine has been run, as the exhaust system becomes very hot. Serious burns could result from contact with the exhaust components. Allow components to cool sufficiently before proceeding. Wear eye protection and gloves. Never run the engine in an enclosed area. Exhaust contains poisonous carbon monoxide gas that can cause loss of consciousness or death in a very short time. NOTE: Make sure line is not kinked or pinched.
Engine and Transmission Mount Locations Periodically inspect engine and transmission mounts for cracks or damage. Rear Mount Periodically clean the spark arrestor to remove accumulated carbon. 1. Remove the retaining screw and remove the arrestor from the end of the muffler. 2. Use a non-synthetic brush to clean the arrestor screen. A synthetic brush may melt if components are warm. 3. Inspect the screen for wear and damage. Replace if needed. 4. Reinstall the arrestor and torque the screw to 5-7 ft. lbs. (7-9 Nm) . Arrestor LH Mount Screen RH Mount Compression and Leakdown Test Muffler NOTE: This engine does NOT have decompression components.
Compression readings will vary in proportion to cranking speed during the test. Retaining Screw 2.16