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TROUBLESHOOTING
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 POSSIBLE CAUSE SOLUTION
Engine will not start or will run
only a few seconds after
starting.
1. No spark
2. Flooded engine.
1. Check Spark. 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
(CMR7H).
2. With the ignition switch off, remove spark plug.
Move choke lever to Run position 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.
Engine starts but will not
accelerate properly:
Carburetor requires “L” (Low jet)
adjustment.
* Contact a Servicing Dealer for carburetor
adjustment.
Engine starts but will not run
properly at high speed.
Carburetor requires “H” (High jet)
adjustment.
* Contact a Servicing Dealer for carburetor
adjustment.
Engine does not reach full
speed and / or emits excessive
smoke
1. Check oil fuel mixture.
2. Air filter dirty.
3. Spark arrester screen dirty.
4. Carburetor requires “H” (High jet)
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.
Engine starts, runs, and
accelerates but will not idle.
Carburetor requires 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.
Engine starts and runs, but
the blade doesn't move
WARNING: Never
touch the blade
while the engine is
running.
1. Blade incorrectly fitted
2. Blade damaged
3. Clutch or transmission shaft
damaged
1. Contact an Authorised Service Centre
2. Contact an Authorised Service Centre
3. Contact an Authorised Service Centre
*Note: This engine complies with EPA (Environmental Protection Agency) and CARB (California Air Resource Board)
regulations which require exhaust emission control. 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.
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