27CS-800PGUIDE BAR• Clean before using.- Clean the groove of the guide bar with a smallscrewdriver.- Clean oil holes with a wire.• Reverse guide bar periodically.• Check sprocket and the clutch and clean the barmount area before installation of the bar.Replace either or both if worn.SPROCKET• A damaged sprocket will cause prematuredamage or wear of saw chain.- When the sprocket has worn out 0.5 mm ormore, replace it.• Check sprocket when you install new chain.Replace it if worn.CYLINDER FINS• Check periodically.• Clogged fins will result in poor engine cooling.• Remove dirt and dust from between fins to letcooling air pass easily.MUFFLER SPARK ARRESTOR• Remove air cleaner cover and remove sparkplug lead.• Remove spark arrestor screen from mufflerbody.• Clean carbon deposits from muffler components.• Replace screen if it is cracked, or has holesburned through.• Assemble components in reverse order.NOTICECarbon deposits in muffler will cause drop inengine output. Spark arrestor screen must bechecked periodically.AUTOMATIC OILER• The discharge volume of the automatic oiler isadjusted to 8 mL/min approximately at 7000r/min, prior to shipment from factory.- To increase the delivery volume, turn theadjusting knob clockwise.When the knob touches stopper and stops,this position indicates maximum dischargevolume. (15 mL/min at 7000 r/min)- Do not turn the adjusting knob beyond themaximum or minimum limit of volumeadjustment.Worn : 0.5 mmGrooveOil holeClutch(Sprocket)Cylinder finsDecreaseIncreaseAdjusting knobSpark arrestor screenMuffler