22
CSG-670 TYPE1-E
CLEAN MUFFLER AND COOLING SYSTEM
The dust created in cutting is drawn into the
cooling system by the rotor fan. It can cover the
cooling fins and clog the air passages. Unless the
system is cleaned in time, the engine will run too
hot. Whenever cleaning the cooling system, take
advantage of the necessary removal of the covers,
and check the muffler at the same time.
1. Always begin cleaning by blowing or wiping
down the outside of the unit before doing any
disassembly.
2. Remove the parts of the air cleaner necessary
to expose the cylinder for cleaning. (See
drawing, page 19.) Be careful to clean out the
air cleaner base plate if any dirt falls into it.
3. Clean all dust and grime out of the cooling
system passageways, and scrape the cylinder
cooling fins down to bare metal.
4. Clean deposits from silencer and tighten bolts.
Use only parts in good condition when
reassembling.
5. Reassemble the air cleaner on the saw.
CLUTCH AND MAXIMUM SPEED CHECKS
CLUTCH
Slipping of the clutch under a cutting load is not the only thing that can
happen to a clutch. Another problem may appear during setting of the
carburetor for proper idling speed. The clutch may be at fault if an
adjustment high enough for stable idling results in wheel rotation. Such a
condition should be checked out by your servicing dealer before any further
use of the saw.
WARNING
To ensure the wheel does not over speed, the engine no load speed
must be adjusted to a maximum of 10,500 r/min. Use a tachometer to
measure speed. If engine speed exceeds 10,500 r/min, have the unit
serviced by your nearest ECHO servicing dealer before further use.
SPEED
Whenever activated, the vibration-sensitive governor in the carburetor high
speed fuel circuit supplies more fuel than the engine can burn.
Consequently, the engine has to purge itself of the extra fuel and slows
down in the process.
Proper high speed adjustment (see page 21) of the carburetor should result
in engine high speed, no load, operation within the desired range. This range
is 10,000 r/min ± 500 r/min, which is required for the proper wheel spindle
speed range of 4,850 - 5,250 r/min.
