28
CSG-7410
Muffler Spark Arrestor
1. Remove air cleaner cover and remove spark
plug lead.
2. Remove the cutter arm. (See page 30.)
3. Remove spark arrestor screen cover and screen
from muffler body.
4. Clean carbon deposits from muffler components.
5. Replace screen if it is cracked, or has holes
burned through.
6. Assemble components in reverse order.
NOTE
Carbon deposits in muffler will cause drop in
engine output. Spark arrestor screen must be
checked periodically.
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.
Speed
WARNING
To ensure the wheel does not over speed, the engine no load speed
must be adjusted to a maximum of 9950 rpm. Use a tachometer to
measure speed. If engine speed exceeds 9950 rpm, have the unit ser-
viced by your nearest ECHO servicing dealer before further use.
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 28) of the Carburetor should result
in engine high speed, no load, operation within the desired range. This range
is 9750 rpm ± 200 rpm, which is required for the proper wheel spindle speed
range of 3700 – 3820 rpm.
Cylinder Fins
1. Check periodically.
2. Clogged fins will result in poor engine cooling.
3. Remove dirt and dust from between fins to let
cooling air pass easily.
Bolts
Spark arrestor screen
Spark arrestor screen cover
Cylinder fins
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