Service Manual

PERIODIC MAINTENANCE 2-7
Periodic Maintenance Procedures
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Remove the foam element and the paper element.
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Clean the foam element [A] in a bath of detergent and water, and let
the element air-dry throughly before installing it.
•
Clean the paper element [A] by tapping it gently on a flat surface to
remove dust. If the element is very dirty, replace it with a new one.
CAUTION
Do not use compressed air to clean the paper element. Do not
oil the paper or foam element.
Air Cleaner Housing (Case and Body) Inspection
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Clean the housing with detergent and water and dry thoroughly.
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Check the housing for deformation or other damage. The housing
must seal well and permit only filtered air to reach the carburetor.
If the housing is damaged, it must be replaced.
•
Check that no foreign material is obstructing the air passage.
Engine Top End
Cylinder Head Cleaning and Inspection
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Scrape the carbon deposits from the head and exhaust port with a
suitable tool [A].
•
To avoid gouging, use scrapers that are made of a material that will
not cause damage.
•
Clean the head in a bath of high flash-point solvent and dry it with
compressed air.
Clean the cylinder head in a well-ventilated area, and take care
that there are no sparks or flame anywhere near the working
area; this includes any appliance with a pilot light. Do not
use gasoline or a low flash-point solvent to clean the cylinder
head. A fire or explosion could result.
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Straight edge [A] across the mating surface of the head at several
different points, and measure warp by inserting a thickness gauge
[B] between the straightedge and head.
If warp exceeds the service limit, repair the mating surface. Replace
the cylinder head if the mating surface is badly damaged.
Cylinder Head Warp
Service Limit: 0.03 mm (0.001 in.)
•
Check the cylinder head for cracks or other damage.
•
Cracks not visible to the eye may be detached by using a metal crack
detection system. (Visual color check: commonly found at automotive
parts tore.)
•
If a crack is present in the cylinder head, replace it.
•
Inspect the mating surface for burrs and nicks.