– Unfavourable running conditions (eg. operating at part load)
– Too much oil or wrong type of oil in fuel tank in 2-Stroke engine.
Do not clean the spark plug in an abrasive grit spark plug
cleaner, as expensive damage to the engine could occur
through loose grit damaging chrome in cylinder bore.
Fit a new spark plug after approximately 50 operating hours or earlier
if electrodes are badly eroded.
Check recommended spark plug is type or equivalent and specified
electrode gap for each engine make.
PAGE 19
MAINTENANCE: ENGINES
AIR FILTER MAINTENANCE
The air filter is one of the most important areas to
maintain. If it is not maintained, engine will be damaged,
also you will void the warranty. Before cleaning make sure
the unit is turned off.
1. If filter is torn or very dirty,
replace.
2. Wash the filter in detergent
and water (Fig.92.) Rinse
the filter thoroughly and
allow to dry.
3. Apply enough clean
engine oil or 2-Stroke
oil to saturate the filter
when squeezed. Squeeze
the filter to spread the oil
and to remove excess oil.
Clean and re-oil the air filter every 10
hours of use. More frequently in dusty
conditions. Eg. every 5 hours.
! NOTE
If the unit is operated with dry or dirty
filter or without the air filter and/or
carburettor air filter cover, you will void the warranty.
! NOTE
FIG 92
MITSUBISHI
ATOM
HONDA
ADJUSTING IDLE SPEED
The idling screw adjustment is accessible without removing the air filter
cover. See Fig.94. To increase engine idle speed, turn IDLE SCREW
(2) clockwise. To decrease engine speed, turn IDLE SCREW counter
clockwise (anti-clockwise). Throttle trigger to be in idle position.
Cable adjustment
can also be used
to adjust idle.
EDGERS, ENGINE DRILLS & TILLERS – Blades or Auger
MUST NOT TURN.
BLOWERS – ALWAYS have FAST idle speed for easier starting.
FUEL FILTER
MAINTENANCE
Hook out fuel filter with piece of
bent wire. Blow clean with
compressed air or
replace.
ATOM
CHECKING THE SPARK PLUG
If engine is low on power, difficult to start or runs poorly at
idling speed, check the spark plug.
• Allow engine to cool down. Remove spark plug.
• Clean dirty spark plug or replace with new spark plug.
• Check electrode gap 0.5mm (0.020”)
• Rectify faults which have caused fouling of spark plug.
Possible faults include:
– Dirty air filter or fuel filter
HONDA, ZENOAH
MITSUBISHI
(2)
(2)
FIG 94
Top view
looking down
on carburettor.
(1)
LEFT SIDE HINGE TABS
HINGE
TAB
ATOM ENGINES JET ADJUSTMENT
26FCS and 26FC3 – High speed approximately 1
1
/4 turns
– Low speed approximately 1
1
/4 turns
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