21
Troubleshooting
Lawn-Boy designed and built your lawn mower for trouble-free operation. Check the following components and items
carefully. If a problem continues, see your Authorized Service Dealer.
PROBLEM
CORRECTIVE ACTION
Engine does not start
1. Fill the fuel tank with a fresh gasoline-and-oil mixture.
2. Move the throttle lever to the
Fast position.
3. Press the primer three times.
4. Connect the wire to the spark plug.
5. Clean the spark plug, check the spark plug gap, and replace
the spark plug if it is damaged.
Engine starts hard or loses power
1. Move the throttle to the
Fast position.
2. Drain and fill the fuel tank with a fresh gasoline-and-oil mixture.
3. Clean the fuel cap vent hole.
4. Clean or replace the air filter element.
5. Clean the lawn mower discharge chute.
6. Clean the underside of the lawn mower deck.
7. Clean the spark plug, check the spark plug gap, and replace
the spark plug if it is damaged.
Engine runs rough
1. Connect the wire to the spark plug.
g
g
2. Clean the spark plug, check the spark plug gap, and replace
the spark plug if it is damaged.
3. Move the throttle lever to the
Fast position.
4. Clean or replace the air filter.
Lawn mower or engine vibrates
i
l
1. Balance the blade.
g
excessively
2. Tighten the blade mounting nut.
3. Clean the lawn mower discharge chute.
4. Clean the underside of the lawn mower deck.
5. Tighten the engine mounting bolts.
Uneven cutting pattern
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. Move the throttle lever to the
Fast position.
2. Raise the cutting height.
3. Allow the grass to dry before mowing.
4. Clean the underside of the lawn mower deck.