Lawn-Boy 10321 - Troubleshooting; Engine will not start; Engine starts hard or loses power; Engine runs rough

EN–15
Troubleshooting
Your mower was designed and built for trouble-free operation. Check the following components and items
carefully. If a problem continues, see your Authorized Lawn-Boy Service Dealer.
PROBLEM CORRECTIVE ACTION
Engine will not start 1. Fill fuel tank with fresh gasoline
2. Press primer three (3) times
3. Spark plug
• Connect spark plug wire
• Clean spark plug, check spark plug gap, replace if
damaged
Engine starts hard or loses power
1. Drain and refill fuel tank with fresh gasoline
2. Clean gas cap vent hole
3. Replace air filter element (Models 10200, 10249, 10313, 10321)
Clean air filters (Models 10248, 10327, 10328, 10330)
4. Clean mower discharge chute
5. Clean underside of mower deck
6. Clean spark plug, check spark plug gap, replace if damaged
7. Check engine oil
Engine runs rough
1. Connect spark plug wire
2. Clean spark plug, check spark plug gap, replace if damaged
3. Replace air filter element (Models 10200, 10249, 10313, 10321)
Clean air filters (Models 10248, 10327, 10328, 10330)
Mower or engine vibrates excessively
1. Balance blade
2. Tighten blade mounting nut
3. Clean mower discharge chute
4. Clean underside of mower deck
5. Tighten engine mounting bolts
Uneven cutting pattern 1. Place all four (4) wheels at same height
2. Sharpen and balance blade
3. Change mowing pattern
4. Clean underside of mower deck
Discharge chute plugs 1. Raise cutting height
2. Allow grass to dry before mowing
3. Clean underside of mower deck
Mower will not self-propel 1. Adjust self-propelled cable
2. Clean debris under belt cover