Yamaha EH63 Service Manual page 39

PERIODIC MAINTENANCE
1
2
Adjustment steps:
a. Loosen the locknut "1" and insert the thickness
gauge between the rocker arm and the valve
stem end.
b. Return or tighten the adjuster "2" and set the
valve clearance to the correct value. Move the
thickness gauge up and down to check for the
proper resistance.
Thickness gauge:
90890-03268
Feeler gauge set:
YU-26900-9
Adjuster
Clockwise
Counterclockwise
c. Tighten the locknut "1".
Valve adjuster locknut:
8 N·m (0.8 kgf·m, 5.9 lb·ft)
6.
Install:
• Cylinder head cover gasket
• Cylinder head cover
• Engine hanger
Cylinder head cover bolt:
8 N·m (0.8 kgf·m, 5.9 lb·ft)
• Breather hose
• Spark plug
Spark plug:
13 N·m (1.3 kgf·m, 9.6 lb·ft)
• Spark plug cap
2-13
Valve clearance
Clearance decreases
Clearance increases
New
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9
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