Maintenance
■INTAKE AIR COOLING VENT 
WARNING
•Never touch the cylinder, muffler, or spark plugs with your bare hands immediately after stopping the engine. The engine can become very hot when in operation, and doing so could result in severe burns.
•When checking the trimmer to make sure that it is okay before using it, check the area around the muffler and remove any wood chips or leaves which have attached themselves to the trimmer. Note that failing to do so could cause the muffler to become overheated, and that this in turn could cause the trimmer to catch on fire. Always make sure that the muffler is clean and free of wood chips, leaves, and other waste before use.
Check the intake air cooling vent and the area around the cylinder cooling fins after every 25 hours of use for blockage, and remove any waste which has attached itself to the trimmer. Note that it is necessary to remove the plug guard shown in Figure 20 in order to be able to view the upper part of the cylinder.
IMPORTANT
If waste gets stuck and causes blockage around the intake air cooling vent or between the cylinder fins, it may cause the engine to overheat, and that in turn may cause mechanical failure on the part of the trimmer.
■PROCEDURES TO BE PERFORMED AFTER EVERY 100 HOURS OF USE
1.Remove the muffler, insert a screwdriver into the vent, and wipe away any carbon buildup. Wipe away any carbon buildup on the muffler exhaust vent at the same time.
2.Tighten all screws, bolts, and fittings.
3.Check to see if any oil or grease has worked its way in between the clutch lining and drum, and if it has wipe it away using
