SECTION C10
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ROCKER CLEARANCES
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It is essential for the correct valve to rocker
clearances, to be maintained to prevent excessively
noisy operation and subsequent wear or conversely
to prevent insufficient clearances, a loss of
compression and burning of the valves and seats.
After checking clearances at the time of the first
free service, the clearances shouid be checked and
corrected as necessary at 5000 mile (8000 Km)
intervals. To provide sufficient room at the rocker
boxes for satisfactory checking, the fuel tank
shouid be removed as in Section F9.
The correct rocker clearances are as below, checked
with the engine cold:
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Std Commando
Engine
Combat Engine
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Inlet
Exhaust
Inlet
Exhaust
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0.006 in. (0.15 mm)
0.008 in. (0.2 mm)
0.008 in. (0.2 mm)
0.010 in. (0.25 mm)
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Proceed to check rocker clearances as below:
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1
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Remove the two exhaust and one inlet rocker
covers.
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2
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To facilitate rotating the engine, remove both
sparking plugs.
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3
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Rotate the engine, either by the kickstart or by
turning the rear wheel forwards with fourth gear
engaged, until the left side inlet valve is fully
open.
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4
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Using the correct feeler gauge (see table above
for thickness) check the rocker clearance of the
right side inlet valve. Fig. C9 shows the point
where the feeler gauge is inserted.
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5
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If the clearance is correct i.e. the feeler
gauge just nips, proceed to check the next valve as
in (7). If gauge will not enter or if it does not
nip, adjust as in (6).
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6
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Referring to Fig. C9, slacken the adjuster
locknut (A) and screw out the adjuster (B) two
turns. Place the feeler gauge between the adjuster
and end of the valve stem and screw the adjuster in
until it just nips the feeler gauge. Tighten the
locknut and withdraw the gauge which shouid not be
gripped tightly but shouid slide relatively easily
from the gap. This clearance is now correct.
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