Ryobi RY4CCS User Manual - Page 16

MAINTENANCE  Reinstall the air filter. NOTE: Make sure the filter is seated properly inside the cover. Installing the filter incorrectly will allow dirt to enter the engine, causing rapid engine wear.  Replace the air filter cover by placing the slots on the air filter cover over the tabs on the housing, then push the cover down until it latches securely in place. FUEL CAP, TANK, AND LINES WARNING: Check for fuel leaks. A leaking fuel cap, tank, or line is a fire hazard and must be replaced immediately. If you find any leaks, correct the problem before using the product. Failure to do so could result in a fire that could cause serious personal injury. 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 an Champion RY4C, Ryobi AC00164A, or equivalent spark plug with .025 in. electrode gap. Use a recommended or equivalent replacement and replace ­annually. NOTICE: Be careful not to cross-thread the spark plug. Crossthreading will seriously damage the product. CHANGING ENGINE LUBRICANT See Figure 21. WARNING: Do not change engine lubricant while it is hot. Accidental contact with hot engine lubricant could result in serious burns. For best performance, engine lubricant should be changed after every 25 hours of operation. To change the engine lubricant:  Stop the engine and disconnect the spark plug wire. Allow the engine to cool completely before proceeding.  Remove the screw from the top engine cover and set aside.  Remove the screws from the bottom engine cover. Remove the bottom cover and set aside.  Remove the oil fill cap/dipstick.  Tip powerhead on its side and allow lubricant to drain from the oil fill hole into an approved container. NOTE: Drain the lubricant while the engine is still warm but not hot. Warm lubricant will drain quickly and more completely.  Return the power head to an upright position and refill with lubricant following the instructions in the Adding/ Checking Engine Lubricant section previously in this manual. NOTICE: Do not overfill. Overfilling the crankcase may cause ­excessive smoke, lubricant loss, and engine damage.  Reinstall the bottom engine cover. Replace the screws and tighten securely.  Replace the screw in the top engine cover and tighten ­securely. NOTE: Used lubricant should be disposed of at an a­ pproved disposal site. See your local retailer for more information. ADJUSTING CAMSHAFT-TO-ROCKER ARM ­CLEARANCE See Figures 22 - 24. Inspect the camshaft-to-rocker arm clearance after every 25 hours of operation. This should be done in a clean, dustfree environment. NOTE: This procedure requires partial disassembly of the engine. If you are unsure if you are qualified to perform this operation, take the unit to a qualified service center.  Stop the engine and disconnect the spark plug wire. Allow the engine to cool completely before proceeding.  Remove the screw from the top engine cover. Remove engine cover and set aside. 12 - English