PERIODIC MAINTENANCE AND ADJUSTMENT7-1375. Clean the sponge material withsolvent, and then squeeze the re-maining solvent out.6. Apply oil of the recommendedtype to the entire surface of thesponge material, and thensqueeze the excess oil out.TIPThe sponge material should be wet butnot dripping.7. Pull the sponge material over theair filter element frame.8. Apply all-purpose grease to the airfilter element seat.9. Insert the air filter element into theair filter case with the projectionfacing upward, and then install thewing bolt and its washer.NOTICE: Make sure that the airfilter element is properly seatedin the air filter case. The engineshould never be operated with-out the air filter element in-stalled, otherwise the piston(s)and/or cylinder(s) may becomeexcessively worn. [ECA10482]NOTICE: Be sure to install thewasher with its curved side fac-ing outward as shown. [ECA16692]1. Sponge material2. Air filter element frame12Recommended oil:Yamaha foam air filter oil or otherquality foam air filter oil1. Air filter element seat11. Air filter element2. Projection