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Clean the cooling system.
Examine the spark arrester screen.
Examine the fuel filter.
Examine the fuel hose for damage.
Examine all cables and connections.
50 hours maintenance
Have an approved service center repair or replace
the muffler.
To adjust the idle speed
Make sure that the air filter is clean and the air filter
cover is attached before you adjust the idle speed.
Adjust the idle speed with the idle adjustment screw
T which is identified with "T" mark.
The idle speed is correct when the engine operates
smoothly in all positions.
(Fig. 31)
1. Turn the idle adjustment screw clockwise for higher
speed.
2. Turn the idle adjustment screw counterclockwise for
lower speed.
To do maintenance on the spark
arrester screen
Use a wire brush to clean the spark arrester screen.
To clean the cooling system
(Fig. 32)
Clean the parts of the cooling system with a brush.
To examine the spark plug
CAUTION:
Always use the recommended
spark plug type. Incorrect spark plug type
can cause damage to the product.
Examine the spark plug if the engine is low on
power, is not easy to start or does not operate
correctly at idle speed.
To decrease the risk of unwanted material on the
spark plug electrodes, obey these instructions:
a) Make sure that the idle speed is correctly
adjusted.
b) Make sure that the fuel mixture is correct.
c) Make sure that the air filter is clean.
If the spark plug is dirty, clean it and make sure that
the electrode gap is correct, refer to
Technical data
on page 13
. (Fig. 33)
Replace the spark plug if it is necessary.
To do the maintenance to the air filter
To clean the air filter
1. Remove the air filter cover and remove the air filter.
(Fig. 34)
2. Clean the air filter with warm soap water. Make sure
that the air filter is dry before you install it.
3. Replace the air filter if it is too dirty to fully clean it.
Always replace a damaged air filter.
4. If your product has a foam air filter, apply air filter oil.
Only apply air filter oil to a foam filter. Do not apply
oil to a felt filter.
Technical data
unit 125B
(125B28HV)
125BX
(125B28HV)
125BVX
(125B28HV)
Engine Specifications
Cylinder displacement cm
3
28 28 28
Electrode gap mm 0.6 0.6 0.6
Fuel tank volume cm
3
500 500 500
Idle speed min
-1
2800 - 3200 2800 - 3200 2800 - 3200
Maximum power speed min
-1
8000 8000 8000
Power output kW 0.8 0.8 0.8
237 - 009 - 16.12.2019 13
13


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