Troubleshooting; Using Troubleshooting Chart - Efco 147 Operator's Instruction Manual

Using Troubleshooting Chart

WARNING: Always stop unit and disconnect spark plug before performing all of the
recommended remedies below except remedies that require operation of the unit.
When you have checked all the possible causes listed and you are still experiencing the problem, see your Servicing
Dealer. If you are experiencing a problem that is not listed in this chart, see your Servicing Dealer for service.
PROBLEM
Engine will not start or will
run only a few seconds after
starting.
(Make sure Ignition switch is
in start position "I")
Engine starts but will not
accelerate properly:
Engine starts but will not run
properly at high speed.
Engine does not reach full
speed and / or emits excessive
smoke
Engine starts, runs, and
accelerates but will not idle.
Bar and Chain Running Hot
and Smoking
Engine starts and runs, but
chain is not rotating
WARNING: Never
touch the chain
while the engine is
running.
*Note: This engine complies with EPA (Environmental Protection Agency) and CARB (California Air Resource Board) regulations
which require exhaust emission control. As a result, the carburetor adjustment needles are equipped with plastic caps that limit
the rotation from the original factory adjustment. If your unit exhibits specific performance problems that can not be corrected
by the Trouble Shooting Section, the unit should be taken to a Servicing Dealer for repair.

TROUBLESHOOTING

POSSIBLE CAUSE
1. No spark
2. Flooded engine.
Carburetor requires "L"
adjustment.
Carburetor requires "H" (High jet)
adjustment.
1. Check oil fuel mixture.
2. Air filter dirty.
3. Spark arrester screen dirty.
4. Carburetor requires "H" (High jet)
adjustment.
Carburetor requires adjustment.
1. Chain oil tank empty.
2. Chain tension too tight.
3. Oiler function.
1. Chain brake engaged.
2. Chain tension too tight.
3. Guide bar and chain assembly.
4. Chain and/or guide bar damaged.
5. Clutch drum and/or rim sprocket
damaged.
SOLUTION
1. Check Spark. Remove air filter cover. Remove
spark plug from cylinder. Reattach the spark
plug wire and lay spark plug on top of cylinder.
Pull the starter rope and watch for spark at
spark plug tip. If there is no spark, repeat test
with a new spark plug (BPMR6A).
2. With the ignition switch off, remove spark plug.
Move choke lever to Run position (pushed in
completely) and pull starter cord 15 to 20 times.
This will clear excess fuel from engine. Clean
and reinstall spark plug. Pull the choke lever
all out and then insert it completely in order
to activate the semi-acceleration device. Pull
starter three times with choke lever at run. If
engine does not start, move choke lever to
choke and repeat normal starting procedure. If
engine still fails to start, repeat procedure with a
new spark plug.
(Low jet) * Contact a Servicing Dealer for carburetor
adjustment.
* Contact a Servicing Dealer for carburetor
adjustment.
1. Use fresh fuel and the correct 2-cycle oil mix.
2. Clean per instruction in Maintenance-Air Filter
Section.
3. Clean per instructions in Maintenance-Spark
Arresting Muffler Section.
4. * Contact a Servicing Dealer for carburetor
adjustment.
Turn idle speed screw "T" clockwise to increase
idle speed. (If chain turns at idle, turn idle speed
screw "T" counterclockwise to decrease speed);
see Operation-Carburetor Adjustment.
1. Oil tank should be filled every time that fuel tank
is filled.
2. Tension chain per instructions in Operation-
Chain Tension section.
3. Run at full throttle 15 to 30 seconds. Stop saw
and check for oil dripping from bar tip guard
and guide bar. If oil is present the chain may be
dull or bar may be damaged. If no oil contact a
Servicing Dealer.
1. Release chain brake, see Operation-Chain
Brake Section.
2. Tension chain per instructions in Operation-Chain
Tension section.
3. Refer to Assembly-Assembling the Bar and
Chain Section.
4. Refer to Maintenance-Chain and/or Maintenance-
Guide Bar Section.
5. Replace if necessary - contact a Servicing Dealer.
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