Valve Clearance - Honda CG125 Fan Owner's Manual

Owner´s Manual

Valve Clearance

(Refer to the Safety Precautions on page 41.)
Excessive valve clearance will cause noise and
eventual engine damage. Little or no clearance will
prevent the valve from closing and cause valve
damage and power loss. Check valve clearance when
the engine is cold at the specified intervals.
The checking or adjusting of the clearance should be
performed while the engine is cold. The clearance will
change as the engine temperature rises.
1. Release the air suction valve assembly (1) by
removing the bolts A (2). Then release the air filter
tube (3) from the clip (4).
2. Remove the air suction pipe (5) by removing the
bolts B (6).
3. Remove the cylinder head cover (7) by removing the
bolts C (8). Pull out the cylinder head cover from the
left side.
(4)
(1)
(2)
(1) Air suction valve
(3)
assembly
(2) Bolts A
(3) Air filter tube
(4) Clip
(8)
(6)
(8)
(5)
4. Remove the crankshaft hole cap (9) and timing hole
cap (10).
5. Rotate the generator flywheel counterclockwise until
the T mark (11) on the flywheel lines up with the
index mark (12) on the timing hole. In this position,
the piston may either be on the compression or
exhaust stroke.
The adjustment must be made when the piston is at
the top of the compression stroke when both the
intake and exhaust valves are closed.
This condition can be determined by moving the
rocker arms. If they are free, it is an indication that
the valves are closed and that the piston is on the
compression stroke. If they are tight and the valves
are open, rotate the flywheel 360° and realign the
T mark to the index mark.
(5) Air suction pipe
(6) Bolts B
(7)
(7) Cylinder head cover
(8) Bolts C
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