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2-22 PERIODIC MAINTENANCE
Periodic Maintenance Procedures
Engine Top End
Air Suction Valve Inspection
•
Remove the air suction valve (see Engine Top End chap-
ter).
•
Visually inspect the reeds for cracks, folds, warps, heat
damage or other damage.
If there is any doubt as to the condition of the reeds [A],
replace the air suction valve as an assembly.
•
Check the reed contact areas [B] of the valve holder for
grooves, scratches, any signs of separation from the
holder or heat damage.
•
If there is any doubt as to the condition of the reed contact
areas, replace the air suction valve as an assembly.
•
If any carbon or other foreign particles have accumulated
between the reed and the reed contact area, wash the
valve assembly clean with a high-flash point solvent.
CAUTION
Do not scrape off the deposits with a scraper as this
could dam age the rubber, requiring replacement of
the suction valve assembly.
Valve Clearance Inspection
NOTE
○
Valve clearance must be checked and adjusted when
the engine is cold (at room temperature).
•
Remove:
Pickup Coil C over
Cylinder Head Cover (see Engine Top End chapter)
•
Position the crankshaft at 1,4 piston TDC.
TDC Mark [A] for #1, 4 Pistons
Timing Mark (crankcase halves mating surface) [B]
•
Using the thickness gauge [A], m easure the valve clear-
ance between the cam and the valve lifter.
Valve Clearance
Standard:
Inlet:
0.15 ∼ 0.24 mm (0.0059 ∼ 0.0094 in.)
Exhaust:
0.22 ∼ 0.31 mm (0.0087 ∼ 0.0122 in.)