162. Cleaning of air cleanerWARNING INFLAMMABLES STRICTLY PROHIBITEDInterval of Cleaning and Inspection: Daily (every 10 operating hours)(1) Loosen the knob bolt.(2) Remove the air cleaner cover.(3) Take out the element and remove any dirt with the brush.Note: The element is a dry type and should not get wet. Never wash withwater.(4) Replace the element with a new one if it is damaged or very dirty.Part No. 6676500201: ELEMENT AIR CLEANER(5) Wipe off any oil that has come in to contact with the breather with a ragor cloth.(6) Install the element in the cleaner case.(7) Attach the air cleaner cover and tighten the knob bolt.3. Checking the spark plug(1) Opening/closing the plug coverTo open the plug cover, pull up on the seam of the plug cover projectionand slide in the direction of the “OPEN” indication as shown in the figureat right.When closing the cover, slide the cover in the “CLOSE” direction till theclick under the plug cover projection rides over the engine cover. Finally,push in the projection.(2) Removing the spark plugUse an attached box wrench to remove or install the spark plug.(3) Checking the spark plugThe clearance between two electrodes of spark plug (see the figure left)is 0.7 to 0.8 mm. Adjust to the correct clearance when it is too wide ortoo narrow.Clean thoroughly or replace the spark plug if it has accumulated carbonor contaminated.(4) Replacing the spark plugFor replacement, use NGK-CMR6A.DANGER• Clean the element several times a day, if excessive dust adheres to it.• If operation continues with the element remaining not cleared of oil, oil in the air cleaner may fall outside, resulting in oil contamination. CAUTION• When removing the spark plug, clean the spark plug and cylinder head first,so that no dirt, sand, etc will enter the cylinder.• You must remove the spark plug after the engine has cooled down in order toavoid damaging the threaded hole in the cylinder.• The spark plug must be installed properly into the threaded hole. If installed atan angle, the threaded hole in the cylinder will get damaged.ElementKnob boltElement coverBreatherLateral electrode (-)Electrode clearance0.7 - 0.8 mm