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WARNING: The engine should be cold before commencing
the spark plug removal procedure.
• Pull the HT lead from the spark plug.
• Using the spark plug socket and 'T-'bar (supplied) remove
A serviceable spark plug in good condition should exhibit
light tan deposits on the plug nose. Remove these deposits
with a stiff brass wire brush.
• Check the electrode gap of the plug using a set of feeler
Fig 20
• Adjust if necessary. The gap should be 0.7mm to 0.8mm
• Re-install the spark plug.
• Hand tighten the plug using the spark plug socket.
• Only use the spark plug socket to produce the gas tight
• Reattach the HT lead to top of the spark plug.
3. Air Filter
WARNING: Never run the engine without the air filter
element fitted.
After approximately 50 hours of use the air filter element
should be removed from its housing, cleaned and refitted.
Fig 21
To remove:
• Ensure that the engine is switched 'OFF' and the fuel tap
• Unscrew the wing nut from the Air Filter housing and
• Carefully store these parts for later re-installation.
• Manoeuvre the Air Filter Housing from the machine
• Remove the Air Filter Element from the housing. (Fig. 22)
The Air Filter Element is washable. Clean the element
thoroughly using an environmentally friendly water based
degreasing agent. Allow to dry naturally. Do not refit a wet
or damp element.
Fig 22
• When dry the element should be lightly sprayed with light
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the spark plug. (Fig. 20)
gauges.
seal which is achieved by the last ½ turn of the spark plug.
is in the 'OFF' position. The engine should be cold.
remove it and its large plate washer and rubber sealing
gasket. (Fig. 21)
machine oil. This will improve the efficiency of the air filter.
To refit:
• Install the cleaned element into the Air Filter Housing.
• Manoeuvre the Air Filter Housing into the machine and
carefully locate it on the carburettor adaptor plate.
• Ensure that all rubber gaskets are serviceable and correctly
seated.
• Replace the wing nut with its large washer and securely
tighten.
4. Fuel Tank Filler Filter
Occasionally visually check the condition of the fuel tank
Fig 23
filter (when refuelling is ideal). If there is any sign of deposit
build up, remove the filter from the tank and clean.
• Clean the filter with environmentally friendly water based
degreasing agent and if necessary blow the fine mesh
through with clean, dry compressed air.
• Allow to dry thoroughly before refitting.
• When refitting ensure that the 2 cut outs on the top edge
of the filter line up with the cut outs in the fuel tank filler
neck. (Fig. 23)
5. Annular Rings and Accessory Locating Pins
The annular rings ensure the precise mating of an accessory
to the EVO-SYSTEM Engine.
• The male annular ring is located around the engine output
Fig 24
shaft. (Fig. 24)
• The female annular ring is located around the accessory
input shaft. (Fig. 25)
The annular rings should be kept scrupulously clean, and
checked at every connection or disconnection.
If any dirt or debris is found it should be removed using a
slightly damp soft cloth.
All other mating surfaces between engine and accessory
should be kept as clean as possible.
The three (3) locating pins and two (2) stabilising pins are
positioned on the accessory.
These pins should also be kept scrupulously clean and free
from dirt or other contamination.
Fig 25
A very light spray coating of silicone machine oil occasionally
applied to their surface will aid accessory connection.
A cover for coupling protection is provided with each
accessory and should be used whenever the accessory is
'remote' from the engine. The engine is also supplied with a
coupling protection cover. This should be fitted whenever
an accessory is removed.
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