Ryobi RY40402A User Manual - Page 15

MAINTENANCE  Return the blower to an upright position and refill with lubricant following the instructions in the Adding/Checking Engine Lubricant section previously in this manual.  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 14 - 15. 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 an authorized service center.  Stop the engine. Allow the engine to cool completely before proceeding.  Remove screws from the engine cover. Remove engine cover and set aside.  Disconnect the spark plug wire.  Using a Torx screwdriver, remove the screw from the rocker arm cover. Remove the cover and set aside.  Position camshaft by pulling the recoil starter grip just until the deep hole in the camshaft gear is located at the 6 o'clock position.  Place the feeler gauge under each rocker arm and measure the gap. The gap should be between .006 in. (0.15 mm) and .008 in. (0.20 mm) for both rocker arms. NOTE: Use a standard automotive feeler gauge. The .006 in. (0.15 mm) feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance but without binding. The 0.008 in. (0.20 mm) feeler gage should not slide between the rocker arms and the cam lobes - it should be held tight.  If the valve clearance is not between .006 in. (0.15 mm) and .008 in. (0.20 mm), the clearance should be adjusted as follows:  While holding a wrench on the flats of the adjusting nut with one hand, loosen the retaining nut with a second wrench. Take care not to loosen the stud.  Rotate the adjusting nut until it touches the feeler gauge. Once the gap setting is correct, hold the wrench on the flats of the adjusting nut and retighten the retaining nut securely.  Adjust the second rocker arm, if necessary.  Replace the rocker arm cover and screw; tighten ­securely.  Replace the top engine cover and screw; tighten s­ ecurely. WARNING: Ensure all engine cover and all engine parts are completely and properly reassembled before starting engine. Failure to correctly reassemble engine can result in serious injury or property damage. 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. HIGH ALTITUDE ENGINE OPERATION Please have an authorized service center adjust this engine if it is to be run above 2000 feet. Failure to do so may result in poor engine performance and increased emissions. An engine adjusted for high altitudes can not be run at 2000 feet or lower. In doing so, the engine will overheat and cause serious engine damage. Please have an authorized service center restore high altitude modified engines to the original factory specification before operating below 2000 feet. 11 - English