Craftsman 247.775890 Owner's Manual

head, top of piston and around valves. Use asoft brush to remove the deposits.Reassemble gasket and cylinder head. Turnscrews down finger-tight. Torque cylinder headscrews in a staggered sequence to 165 in.-Ibs.,_ WARNING: Temperature of muffler andnearby areas may exceed 150 ° F(65°C).Avoid these areas.Spark Plug• Clean the spark plug and reset the gap to .030"at least once a season or every 50 hours ofoperation. See Figure 16. Spark plugreplacement is recommended at the start ofeach season. Refer to engine parts list forcorrect spark plug type.• Inspect periodically, and replace if necessary. Ifyour engine is equipped with a spark arresterscreen assembly, remove every 50 hours forcleaning and inspection. Replace if damaged•_lb WARNING: Always stop engine,disconnect spark plug wire, and move itaway from spark plug before performing anyadjustments or repairs.LubricationLubricate the pivot points on the release bar, hopperassembly, chute deflector and chipper chute once aseason using a light oil. See Figure 17.Figure 16NOTE: Do not sandblast spark plug. Spark plugshould be cleaned by scraping or wire brushing andwashing with a commercial solvent.MufflerWARNING: Do not operate the chipper-shredder without a muffler, or tamper withthe exhaust system. Damaged mufflers orspark arresters could create s fire hazard.Figure 1714