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Check the spark plug for dirt and grime
after 50 hours of operation and if necessary
clean it with a copper wire brush. Thereafter
service the spark plug after every 50 hours of
operation.
1. Pull off the spark plug boot (Fig. K1)
by twisting.
2. Remove the spark plug (Fig. K2) with
the supplied spark plug wrench.
3. Assemble in reverse order.
7.2.4 Grinding the safety guard blade
The safety guard blade (Fig. L/Item F) can
become blunt over time. Clamp the blade
in a vise. Sharpen the blade with a flat file
and make sure that the angle of the cutting
edge is not altered in the process. File in one
direction only.
7.2.5 Carburettor settings
Important. Settings on the carburettor may
only be made by an authorised petrol
repair agent.
Helpline No. UK 0151 649 1500 / IRE 189 094 6244
Setting the throttle cable:
If the maximum speed of the machine
falls over time and you have ruled our
all the other causes listed in section 9
Troubleshooting, it may be necessary to
adjust the throttle cable.
First of all check whether the carburettor
opens fully when the throttle lever is pressed
fully. This is the case if the carburetor slide (Fig.
O1/Item 1) rests against the stop (Fig. O1/Item
2) when the throttle is fully open. Figure 16
shows the correct setting. If the
carburetor slide does not touch the stop, it
must be adjusted.
The following work is required to adjust the
throttle cable:
• Undo the lock nut (Fig. O2/Item 3)
a few turns.
• Undo the adjusting screw (Fig. O2/Item
4) until the carburettor slide rests against
the stop when the throttle is fully open, as
shown in Figure O1.
• Retighten the lock nut.
Setting the idling speed:
Important. Set the idling speed when the
machine is warm.
If the engine stalls when the throttle is not pressed
and you have ruled out all the other causes
listed in section 9 Troubleshooting, the idling
speed must be adjusted. To do this turn the
idling speed screw (Fig. O2/Item 5) clockwise
until the machine runs smoothly at idling speed.
If the idling speed is so fast that the cutting tool
turns as well, it has to be reduced by turning the
idling speed screw counter-clockwise (Fig. O2/
Item 5) for as long as is required for the cutting
tool to stop turning as well.
17
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