8
Lubrication and Maintenance
Air Cleaner Service
A dirty filter will restrict air flow to the carburettor
and reduce engine power. Operating without the
air cleaner fitted or with a damaged filter will allow
dirt to enter the engine causing rapid wear, which
will not be covered under warranty.
Unscrew the wing nut and remove the air cleaner
cover. Unscrew the lower wing nut and remove the
filter assembly. Remove the outer foam element
from the paper element.
Inspect both elements and replace if damaged.
Always replace the paper element at the
scheduled service interval. Clean both elements if
they are suitable for reuse.
Tap the paper element several times on a hard
surface to remove dirt, or blow compressed air not
exceeding 200kPa (30 psi) through the element
from the inside. Never brush dirt off as this will
force dirt into the fibres.
Rinse the foam element in warm soapy water or
clean in non-flammable solvent (not petrol) and
allow to dry. When dry, dip the element in clean
engine oil then squeeze out all excess. The engine
will smoke if too much oil is left in the foam.
Clean the interior of the air cleaner cover and base
with a moist cloth. Take care to avoid dirt entering
the air duct.
Fit the foam element over the paper element and
re-install the filter assembly on the air cleaner
base, making sure the gasket is in place. Tighten
the lower wing nut firmly then install the air cleaner
cover and tighten the upper wing nut.
Fuel Sediment Cup
Move the fuel valve to the Off position then
unscrew the sediment cup and remove the O-ring.
Wash the cup and O-ring in non-flammable solvent
and dry thoroughly. Place the O-ring in the fuel
valve then screw the sediment cup into place and
tighten securely.
Move the fuel valve to On and check for leaks.
Replace the O-ring if there is leakage.
Spark Plug Service
Disconnect the spark plug lead and remove any
dirt from around the plug. Remove the plug with a
13/16 inch spark plug wrench.
Inspect the spark plug and clean any carbon from
the electrodes with a wire brush. Replace if the
electrodes are worn or the insulator is damaged.
Measure the electrode gap with a spark plug
gauge or feelers and adjust as necessary by
carefully bending the side electrode - refer diagram
below for gap dimension.
Install the plug carefully by hand to avoid cross-
threading. Then after it is seated tighten with the
spark plug wrench to compress the gasket. If
refitting a used plug tighten 1/8 to 1/4 turn after
seating or if a new plug 1/2 turn. Refit the spark
plug lead.
The recommended plug is NHSP LD F6RTCU.
SPARK PLUG GAP
0.28 – 0.31 in
(0.70 – 0.80 mm)
Wing Nut
Lower
Wing Nut
Paper Element
Foam Element
Gasket
Air Cleaner
Cover
AIR CLEANER COMPONENTS
Air Cleaner
Base
FUEL SEDIMENT CUP
O-Ring
Sediment Cup
Fuel Valve
