Ryobi RY29550 Operator's Manual - Page 17

MAINTENANCE installing string in pro cut IITM string head See Figure 20. Use monofilament string between .095 in. and .105 in. diameter. Use original manufacturer's replacement string for best performance.  Stop the engine and disconnect the spark plug wire.  Gather two of the pre-cut lengths of trimmer string provided or cut two pieces of trimmer string, in 11 in. lengths.  Insert the strings into the slots located on the sides of the string head. String should be pushed in until approximately 1 in. protrudes from the holes on the top of the string head.  Remove old string by pulling it from the holes located on the top of the string head. CLEANING THE EXHAUST PORT, MUFFLER and spark arrestor NOTE: Depending on the type of fuel used, the type and amount of lubricant used, and/or your operating conditions, the exhaust port, muffler, and/or spark arrestor screen may become blocked with carbon deposits. If you notice a power loss with your gas powered tool, you may need to remove these deposits to restore performance. We highly recommend that only qualified service technicians perform this service. The spark arrestor must be cleaned or replaced every 50 hours or yearly to ensure proper performance of your product. Spark arrestors may be in different locations depending on the model purchased. Please contact your nearest service dealer for the location of the spark arrestor for your model. Idle Speed Adjustment See Figure 21. If the cutting attachment turns at idle, the idle speed screw needs adjusting on the engine. Turn the idle speed screw counterclockwise to reduce the idle RPM and stop the cutting attachment movement. If the cutting attachment still moves at idle speed, contact a service dealer for adjustment and discontinue use until the repair is made. CLEANING AIR FILTER screen See Figures 22 - 23. For proper performance and long life, keep air filter screen clean.  Remove the air filter cover by pushing down on the latch with your thumb while gently pulling on the cover.  Brush the air filter screen lightly to clean.  Replace the air filter cover by inserting the tabs on the bottom of the cover into the slots on the air filter base; push the cover up until it latches securely in place. FUEL CAP WARNING: A leaking fuel cap is a fire hazard and must be replaced immediately. The fuel cap contains a non-serviceable filter and a check valve. A clogged fuel filter will cause poor engine performance. If performance improves when the fuel cap is loosened, check valve may be faulty or filter clogged. Replace fuel cap if required. SPARK PLUG replacement This engine uses a Champion RCJ-6Y or NGK BPMR7A spark plug with .025 in. electrode gap. Use an exact replacement and replace annually. STORING THE PRODUCT  Clean all foreign material from the product. Store idle unit indoors in a dry, well-ventilated area that is inaccessible to children. Keep away from corrosive agents such as garden chemicals and de-icing salts.  Abide by all ISO and local regulations for the safe storage and handling of gasoline. When storing 1 month or longer:  Drain all fuel from tank into a container approved for gasoline. Run engine until it stops. WARNING: The cutting attachment should never turn at idle. Turn the idle speed screw counterclockwise to reduce the idle RPM and stop the cutting attachment, or contact a service dealer for adjustment and discontinue use until the repair is made. Serious personal injury may result from the cutting attachment turning at idle. 13 - English