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Owner’s Manual
ECV-4501
Decompression valve (Fig. 3-11)
After extended period of use decompression valve may not close or come out due to the built up carbon inside
of the valve mounting hole (1). To remove the carbon, take the following steps.
1 . Remove air filter 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 2.5mm to 2.8mm 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 wintertime.
1 . When you need icing system work, remove air filter cover (1). Pull out the shutter (3) from inside the air
filter cover and reinstall it in winter time position (5) by turning halfway. 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 fan case. (Fig. 3-12B)