NOTE
VALVE CLEARANCE ADJUSTMENT
Excessive valve clearance will cause noise, and
little or no clearance will prevent the valve
from closing and cause valve damage and
power loss. Check valve clearance at the
specified intervals (page 26).
1
4
3
(1) Crankshaft hole cap (2) Timing hole cap
(3) 'T' mark (4) Index mark
Checking or adjusting of valve clearance
should be performed while the engine is cold.
The clearance will change as the engine
temperature rises.
The adjustment must be made when the
piston is at Top Dead Center and both the
inlet and exhaust valves are closed.
index mark (4) on the left crankcase cover.
In this position the piston will either be on
the compression or exhaust stroke.
This condition can be determined by moving
the rocker arms. If they are free, it is an
indication that the valves are closed and the
piston is in compression stroke.
•
Check the clearance by inserting the feeler
gauge (5) between the adjusting screw (6)
and valve stem.
If they are tight, the valves are open, rotate the
flywheel 360° anticlockwise and re-align the
'T' mark with the index mark.
2
35
CAUTION
!!
Never adjust air screw (2). Air screw
adjustment is to be done only by Authorised
Hero MotoCorp workshop.
•
Rotate the flywheel anticlockwise until the
‘T’ mark (3) on the flywheel coincides with
•
Remove the crankshaft hole cap (1), timing
hole cap (2) and tappet covers.
(5) Feeler gauge (6) Adjusting screw
(7) Lock nut
Standard valve clearance (cold condition)
Intake: 0.10 mm Exhaust: 0.10 mm
Adjust by loosening the lock nut (7) and
turning the adjusting screw until there is a
5
76
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