Ryobi ZR51950A - Manual (Page 24)

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Engine will not start
Engine does not reach full speed
and emits excessive smoke
Line will not advance when us-
ing automatic line lengthening
Retaining cap hard to turn when
using automatic line lengthening
Grass wraps around the trim-
mer head assembly and the
attachment shaft
Oil drips from muffler
1. Set switch to the I (ON) position.
2. Remove the spark plug. Reattach the spark
plug cap and lay the spark plug on the metal
cylinder. Pull the starter cord and watch for a
spark at the spark plug tip. If there is no spark,
repeat the test with a new spark plug.
3. Push primer bulb until the bulb is full of fuel.
If the bulb does not fill, the primary fuel deliv-
ery system is blocked. If the primer bulb fills,
the engine may be flooded. (See next item.)
4. Remove the spark plug. Turn the product so
that the spark plug hole is aimed at the ground.
Make sure the start lever is set to RUN
and pull the starter cord 10 to 14 times. This
clears excess fuel from the engine. Clean and
reinstall the spark plug. With the trigger fully
depressed, pull the starter cord 3 times. If the
engine does not start, set the start lever to
START and follow normal starting instruc-
tions. If the engine still fails to start, repeat the
procedure with a new spark plug.
5. Contact an authorized service dealer.
1. Use fresh fuel and the correct 2-cycle oil mix.
2. Clean the air filter.
3. Clean the spark arrester.
1. Lubricate with silicone spray.
2. Install more line.
3. Pull line while alternately pressing down on
and releasing the retaining cap.
4. Remove line from spool and rewind.
5. Advance line at full throttle.
Clean the threads and lubricate with grease. If this
does not solve the problem, replace the retaining cap.
1. Cut tall grass from the top down.
2. Operate the product at full throttle.
1. Operate the product at full throttle.
2. Use fresh fuel and the correct 2-cycle oil mix.
3. Clean the air filter.
1. Switch set to the O (OFF)
position.
2. No spark
3. No fuel
4. Flooded engine
5. Starter cord pulls harder now
then when new
1. Check oil fuel mixture
2. Air filter is dirty
3. Spark arrestor screen is dirty
1. Line welded to itself
2. Not enough line on the spool
3. Line worn too short
4. Line tangled on spool
5. Engine speed too slow
Screw threads are dirty or
damaged
1. Cutting tall grass at ground
level
2. Operating the product at part
throttle
1. Operating the product at part
throttle
2. Check oil/fuel mixture
3. Air filter is dirty
Problem Possible Cause Solution
Troubleshooting
Troubleshooting