21
D. CLEANING THE AIR FILTER.
Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult.
If there is a noticeable loss of engine power:
MAINTENANCE
ST23, 26
1
5
4
3
4
5
3
ST35
Air intake
Air out flow
Air out flow
1. Turn the choke lever (Ref. 1) to “CLOSE”.
Loosen the screw (Ref. 2) and remove the air
filter cover (Ref. 3).
2. Remove the foam element (Ref 4) and felt
element (Ref.5).
3. Wash the air filter in warm, soapy water and dry.
4. Always replace a damaged foam element.
5. Fit the foam element in the filter housing.
6. Fit the filter cover and engage it in position.
7. Tighten the screw firmly.
E. COOLING SYSTEM MAlNTENANCE.
The cooling system relies on cooling air entering
the engine through the bottom engine grille located
between the fuel tank and starter. The
cooling fan pushes this air through the cylinder fin
area and out the rear grille openings in the engine
cover.
IMPORTANT
To maintain proper engine operating
temperatures, cooling air must pass freely
through the cylinder fin area. This flow of air
carries combustion heat away from the engine.
Overheating and engine seizure can occur when:
1. Air intakes are blocked, preventing cooling air
from reaching the cylinder.
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