26
MAINTENANCE EVERY YEAR
3.20 Changing the air filter
i Note
The condition of the air filter depends
decisively on the amount of dust in the air.
Fig. 40
l
Remove the cover 1 (Fig. 40).
l
Dispose of the foam insert (2) and the
paper filter (3).
! Caution
No dust must fall into the carburetor.
l
Install a new filter
l
Insert a new seal ring (4).
l
Reinstall the cover (1).
3.21 Checking, adjusting the valve
clearance
i Note
Check and adjust the valve clearance only
when the engine is cold.
l
Pull the spark plug socket 1 off.
l
Pull the ventilation hose off.
l
Remove the valve cover with gasket.
l
Move the piston to the upper dead center
of the compaction stroke.
l
Therefore adjust the triangular mark on the
starter pulley to the upper bore.
i Note
Outlet valve 1 (Fig. 43) = valve clearance 0.20
mm Inlet valve = valve clearance 0.15 mm
l
Check the valve clearance with a feeler
gauge. For adjusting hold the hexagon nut
on the rocker arm and loosen the counter
nut.
l
Adjust the hexagon nut on the rocker arm
so that the feeler gauge fits through the
gap between rocker arm and valve with
only little resistance after retightening the
counter nut .
l
Insert a new gasket, push the ventilation
hose into the socket and fasten the valve
cover evenly.
