PERIODIC MAINTENANCE 2-9
VALVE CLEARANCE
Inspect initially after 20 hours (1 month) and every
200 hours (12 months) thereafter
CHECKING AND ADJUSTING VALVE CLEARANCE
Checking
(1) Remove following parts :
• Engine side lower cover (see page 8-2)
• Recoil starter (Manual start model)
• Flywheel cover (Electric start model)
• Spark plugs
(2) Remove breather hose 2 from cylinder head cover 1.
(3) Remove the eight (8) bolts 3 securing the cylinder head
cover to the cylinder head and remove cylinder head cover
1.
(4) Rotate crankshaft clockwise to bring each piston to Top
Dead Center (TDC) on compression stroke.
Rotate crankshaft clockwise to prevent water pump
impeller damage.
NOTE :
• Piston must be at its TDC on compression stroke to check
or adjust valve clearance.
• Valve clearance specification is for COLD engine condition.
(5) Measure valve clearance by inserting thickness gauge be-
tween valve stem end and valve adjusting screw on rocker
arm.
[ 09900-20803 : Thickness gauge
Valve clearance (cold engine condition) :
IN. 0.13 – 0.17 mm (0.005 – 0.007 in.)
EX. 0.13 – 0.17 mm (0.005 – 0.007 in.)
If out of specification, adjust valve clearance.
1. Lock nut
2. Valve adjusting
screw
3. Valve stem
4. Valve clearance
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