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ADJUSTING THE CARBURETTOR
• The carburettor has been factory adjusted, but may require fine tuning due to a change in operating conditions.
Carburettor adjustments should be made by the supplying dealer using specialist tools as follows.
• Make sure that the air filter and fuel filter are clean, and the fuel is freshly mixed.
• Stop the engine and screw in both the H and L needles until they stop. Never force them. Then set them back
the initial number of turns as shown below.
H screw: 1 +or- ¼
L screw: 1 ¼ +or- ¼
1. Start the engine and allow it to warm up at half-throttle with saw chain and guide bar fitted.
2. Turn the L screw slowly to find a position where idling speed is at maximum, then set the L adjusting screw
back a quarter (1/4) turn (counter clockwise).
3. Turn the idle adjusting screw T counter clockwise so that the saw chain does not turn. If the idling speed is
too slow, turn the screw clockwise.
4. To check the low speed adjustment pull the throttle fully and the engine should not die, if it tries to die, open
the L screw slightly and re-adjust idle if necessary.
5. Set the engine to full throttle, the H adjusting screw is turned clockwise to reduce fuel, as the fuel mixture is
reduced, the engine will run faster until it sounds as if it is screaming, at this point, turn the H screw counter
clockwise by quarter (1/4) turn to allow more fuel.
A two-stroke engine relies on the fuel mixture to cool the engine; a lean fuelled engine will run fast but
can
overheat and lead to engine seizure.
Component Procedure Before
use
Every
25
Hours
use
Every
50
Hours
use
Every
100
Hours
use
note
Fuel leaks / spillage
Wipe out
X
Fuel tank, filter
Inspect / clean
X
Replace if necessary
Idle adjust screw
See paragraph 3 above
X
Adjust carburettor if
necessary
Spark plug BPMR7A
Clean and readjust
plug gap
X
GAP .025” (0.6-0.7mm)
Replace, if necessary
Cylinder fins, Intake air
cooling vent
Clean
X
Muffler, Spark arrestor,
cylinder exhaust port
Clean
X
Throttle lever, ignition
switch
Check operation
X
Air filter
Clean
X
Screws, nuts, bolts
Tighten / replace
X
X
Not adjusting screws
Oiling port
Clean
X
Guide bar
Clean
X
T idle adjust screw
L low speed ad
ust screw
H hi
h speed ad
ust screw
(16 pages)
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