Lawn-Boy 10550 - Engine Performance Issues; Operational Issues

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Problem Corrective ActionPossible Causes
Engine runs rough 1. The wire is not connected to
the spark plug.
2. The spark plug is pitted, fouled,
or the gap is incorrect.
3. The throttle lever is not in the
Fast position.
4. The air filter element is dirty
and is restricting the air flow.
1. Connect the wire to the spark
plug.
2. Check the spark plug and
adjust the gap if necessary.
Replace the spark plug if it is
pitted, fouled, or cracked.
3. Move the throttle lever to the
Fast position.
4. Replace the air filter element.
Lawn mower or engine vibrates
excessively
1. The blade is bent or is out of
balance.
2. The blade nut is loose.
3. The underside of the lawn
mower deck contains clippings
and debris.
4. The engine mounting bolts are
loose.
1. Balance the blade. If the blade
is bent, replace it.
2. Tighten the blade nut.
3. Clean the underside of the lawn
mower deck.
4. Tighten the engine mounting
bolts.
Uneven cutting pattern 1. All four wheels are not at the
same height.
2. The blade is dull.
3. You are mowing in the same
pattern repeatedly.
4. The underside of the lawn
mower deck contains clippings
and debris.
1. Place all four wheels at the
same height.
2. Sharpen and balance the
blade.
3. Change the mowing pattern.
4. Clean the underside of the lawn
mower deck.
Discharge chute plugs 1. The throttle lever is not in the
Fast position.
2. The cutting height is too low.
3. You are mowing too fast.
4. The grass is wet.
5. The underside of the lawn
mower deck contains clippings
and debris.
1. Move throttle lever to the Fast
position.
2. Raise the cutting height.
3. Slow down.
4. Allow the grass to dry before
mowing.
5. Clean the underside of the lawn
mower deck.
Lawn mower does not self-propel 1. The self-propel drive cable is
out of adjustment or is
damaged.
2. There is debris under the belt
cover.
1. Adjust the self-propel drive
cable. Replace the cable if
necessary.
2. Clean the debris from under
the belt cover.