7.3 Carburetter adjustment
The carburetter is adjusted at the factory for
optimum performance. The carburetter may
need to be adjusted, subject to location
(mountains, low-lying areas).
Fig. 6
The carburetter is equipped with
3 setting screws:
Idle end-stop screw "T" (1)
Idle mixture regulating screw "L" (2)
Full load mixture regulating screw "H" (3)
The regulating screws for full load and idle
mixture can only be adjusted within a limited
range.
The following instructions are for your service agent.
Note: The basic settings apply to the com-
plete, ready-to-use and fully assembled equip-
ment. The air filter must be clean to achieve a
correct idle adjustment.
Let the engine run until it is warm.
Idle speed = 2800 rpm max.
permissible speed = 7000 rpm.
Slightly turn the idle end-stop screw "T" (1)
anticlockwise, if the idle speed is too high.
Slightly turn the idle end-stop screw "T" (1)
clockwise, until the motor runs smoothly, if
the idle speed is too low (in other words if the
engine refuses to start/stalls).
Please note: The carburetter is ad-
justed to achieve maximum engine
power. Always use a tachometer to
carry out this adjustment. Never select
a higher speed, otherwise engine
damage can result.
7.4 Spark plug information
The interference-free spark plug
(energy value 200) is available, amongst
others, under the following description:
BOSCH WS6F CHAMPION RCJ-6Y
or equivalent.
The correct electrode gap is 0.5 mm.
14
Regularly check the spark plug, i.e. every
50 hours.
Immediately replace the spark plug if the
electrode has been worn away - otherwise
every 100 hrs. For spark plug replacement, see
chapter 6.3 "If the engine fails to start".
Only use spark plugs with a fixed thick con-
nection nut at the top. Otherwise there is a
risk of fire through sparks.
Always firmly push the spark plug cap on to
the spark plug.
7.5 Air filter maintenance
Contaminated air filters reduce engine per-
formance. They increase fuel consumption
and, therefore, exhaust emissions. Further-
more, they make starting more difficult. Regu-
larly carry out the following maintenance
proceedures:
Fig. 7
Push in tab (1), pivot and remove the filter
cover (2). Clean the area around the filter.
Fig. 8
Remove the prefilter (1) and the main filter
(2) from the filter housing (3). When using the
equipment all day, clean the prefilter and the
main filter daily.
Under extremely dusty conditions, clean the
filters during the day as well. Simply tapping
or blowing through the filter with compressed
air is the best method for daily cleaning. Im-
mediately replace any damaged filters. Motor
damage caused by inadequate care is ex-
cluded from our warranty.
Insert the new or cleaned prefilter and main
filter into the filter housing (3), replace and
secure the filter cover by clicking it into place.
Never use damp or wet prefilters or
main filters.
7.6 Silencer
If the engine runs unsatisfactorily, although
the air filter has been cleaned and the
carburetter has been properly adjusted,
this may also be due to a contaminated
or damaged silencer. Please seek the advice
of your local service agent.