Fig.3-11 Fig.3-12 Fig.3-12B
Decompression valve (Fig. 3-11)
After extended period of use decompression
valve may not close or come out due to the
builtup carbon inside of the valve mounting hole
(1). To remove the carbon, take the following
steps.
1. Remove airfilter cover, cylinder cover, spark
plug and decompression valve from the unit.
2. Viewing through the spark plug hole, crank
down the piston to the lowest position by
pulling recoil starter slowly.
3. Prepare ø2.5 mm to ø2.8 mm drill bit.
4. Lay down the unit facing the valve mounting
hole downward so that the removed carbon
will not drop into cylinder.
5. Insert the drill bit into the hole turning slowly
so that the bit will scrape off the built up
carbon.
6. Make sure to remove the drill bit and pull
recoil starter several times.
7. Reinstall the disassembled parts.
Icing protection system (Fig. 3-12, 12B)
This system is to protect carburetor from icing
when the unit is operated in winter time.
1. When you need icing system work, remove
airfilter cover (1). Pull out the shutter (3) from
inside the airfilter cover and reinstall it in
winter time position (5) by turning half-way.
This will allow heated air to flow from cylinder
side to carburetor cabin through the opening
(2).
NOTE!
When winter time has been over and carburetor
will not suffer from icing, make sure that the
shutter is reinstalled in ordinary position (4).
NOTE!
When the unit is used in very cold weather, it is
advisable to cover the slits of the halfway down
of recoil starter side with glue tape (1) so that
snow dust will not get into fancase. (Fig. 3-12B)
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