GB–25
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/oil mix.
g
2.
Move throttle lever to FAST position.
3.
Press primer three (3) times.
4.
Spark plug
•
Connect spark plug wire.
•
Clean spark plug, check spark plug gap, replace if
damaged.
Engine starts hard or loses power
1.
Move throttle lever to FAST position.
2.
Drain and refill fuel tank with fresh gasoline/oil mix.
3.
Clean gas cap vent hole.
4.
Clean or replace air filter element.
5.
Clean mower discharge chute.
6.
Clean underside of mower deck.
7.
Clean spark plug, check spark plug gap, replace if
damaged.
Engine runs rough
1.
Connect spark plug wire.
g
g
2.
Clean spark plug, check spark plug gap, replace if
damaged.
3.
Move throttle lever to FAST position.
4.
Clean or replace air filter element.
Mower or engine vibrates excessively
1.
Balance blade.
g
y
2.
Tighten blade mounting nut.
3.
Clean mower discharge chute.
4.
Clean underside of mower deck.
5.
Tighten engine mounting bolts.
