13Checking and adjusting the idling speedThe cutting blades should not run when the engine is at idle.- Idle speed should be set to 3,000 min -1 (rpm).- If necessary, adjust the idle screw (the cutting blades must not run when theengine is on idle).• The cutting blades run while idling - turn the idle screw counterclockwise todecrease the idle speed.• The engine stops while idling - turn the idle screw clockwise to increase the idlespeed.- If the cutting blades still continue to run at idle after the adjustment, consult yournearest authorized service agent.• The clutch should engage at 3,750 min-1 (rpm) or higher revolution.• Check the functioning of the I-O switch, the lock-off lever and the throttle lever.Cleaning the air cleanerDANGER: Inflammables strictly prohibitedCheck and clean the air cleaner daily or every 10 operating hours.- Turn the choke lever to the close side fully, and keep the carburetor free fromdust or dirt.- Loosen the fixing bolt.- Pull the rear side of the air cleaner cover and move it forward to detach.- If oil adheres to the element (sponge), squeeze it firmly.- For heavy contamination:1) Remove the element (sponge), immerse it in warm water or in water-dilutedneutral detergent, and dry it completely.2) Clean the element (felt) with gasoline, and dry it completely.- Before attaching the elements, be sure to dry it completely. Insufficient drying ofthe elements may lead to difficult startup.- Wipe out oil adhering around the air cleaner with waste cloth.- Immediately after cleaning is finished, attach the cleaner cover and tighten it withfixing bolts. (In remounting, first place the upper claw.)Points in handling the air cleaner elements- Clean the elements several times a day, if excessive dust adheres to it.- If operation continues with the elements remaining not cleared of oil, oil inthe air cleaner may fall outside, resulting in oil contamination.Element (Sponge)Fixing boltElement (felt)Upper claw