Shindaiwa C254 - Manual (Page 18)

18
Combustion chamber should be decarbonized, and the valve clearance should be adjusted. It is highly recommended
■
that this is done by a Shindaiwa-trained service technician.
Replace the spark plug annually: Use only the type recommended in the ”Specifications” section or an equivalent resis-
■
tor type spark plug of the correct heat range. Set spark plug electrode gap to 0.6 mm (0.024 in).
Maintenance (continued)
50-hour maintenance
Remove and replace the fuel filter
element.
Use a hooked wire to extract the fuel
■
filter from inside the fuel tank. Inspect
the fuel filter element. If it shows signs
of contamination, replace with a genu-
ine Shindaiwa replacement fuel filter
element.
CAUTION!
Make sure you do not pierce the fuel
line with the end of the hooked wire.
The line is delicate and can be dam-
aged easily.
135-Hour Maintenance
Before reinstalling the new filter ele-
■
ment, inspect the condition of all the
fuel system components (fuel pick-
up line, fuel return line, tank vent
line, tank vent, fuel cap and fuel
tank). If damage, splitting or dete-
rioration is noted, the unit should
be removed from service until it can
be inspected or repaired by a Shin-
daiwa-trained service technician.
IMPORTANT!
If a new gasket is not available and/
or the old gasket is not damaged, the
old gasket may be reused. Never use
cracked or damaged gaskets!
Turn adjustment screw (clockwise = 4.
tighter, counter-clockwise = looser)
until feeler gauge is almost snug.
Back off just enough to allow gauge
to slip out with limited resistance.
While holding the adjustment 5.
screw in place with the Allen driver,
tighten the locknut with a wrench.
Turn engine over several times, and 6.
returnthe to TDC-compression.
Recheck with proper feeler gauge
to make sure clearance adjust-
ment did not change as a result of
tightening the locknut. Readjust as
necessary.
Replace rocker arm cover gasket 7.
to assure proper sealing and install
cover.
Remove cylinder cover, rocker arm 1.
cover, and spark plug. Rotate the
crankshaft while observing the piston
through the spark plug opening. When
the piston is at the top of the compres-
sion stroke (TDC), the valves can be
adjusted.
Loosen adjuster locknut so that the 2.
2.5 mm Allen socket head adjust-
ment screw can turn freely.
Insert 0.10 mm feeler gauge
3.
between valve stem tip and rocker
arm.
CAUTION!
Performing a valve adjustment
■
incorrectly may cause hard
starting and/or can damage the
engine.
If you are unfamiliar with this
■
engine or uncomfortable with
this procedure, consult with an
authorized Shindaiwa servicing
dealer.
Valve Adjustment
Fuel filter element
Hooked wire
IMPORTANT!
The valve clearance should be adjusted. It is highly recommended that this is
done by a Shindaiwa-trained service technician.