O.S. Engines FS-26S-CX - Manual (Page 20)

Re-tighten locknut while holding adjusting
screw stationary. (Fig.5.) 4.
Hold at the screw head.
Fig.5
Tighten Locknut.
Remove 0.04mm feeler, rotate the
crankshaft through two revolutions and
recheck gap. 5.
If clearance is correct, slacken locknut on
the other rocker-arm and repeat steps 1 to 5
above. Finally, replace rocker box cover. 6.
Remember:
Excessive valve clearance will cause loss of
power, due to valve (s) not opening
sufficiently. On the other hand, a total loss of
clearance may cause difficult starting due to
valves not closing properly, resulting in loss
of compression.
CARE & MAINTENANCE
At the end of each operating session, drain
the fuel tank, then energize the glowplug and
try to re-start the engine to burn off any fuel
that may remain inside. Repeat this
procedure until the engine fails to fire. Then
remove the glowplug and drain off any
residue while the engine is still warm.
Inject some corrosion-inhibiting after-run oil
and rotate the crankshaft to distribute oil to
the working parts. Do not inject such oil into
the carburettor, however, as it may cause
deterioration of the carburettor's O-ring seals.
Apply a little lubricating oil to the rocker shaft
and rocker arms.
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Note!
These maintenance procedures will reduce
the risks of corrosion or starting difficulties
after a period of storage.
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