Troubleshooting - MTD 760-770 Operator's Manual

Troubleshooting

Problem
Engine Fails to start
Engine runs erratic
Engine overheats
Occasional skips
(hesitates) at high speed
Idles poorly
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Cause
1. Blade control disengaged.
2. Spark plug boot disconnected.
3. Fuel tank empty or stale fuel.
4. Engine not primed (if equipped with primer).
5. Faulty spark plug.
6. Blocked fuel line.
7. Engine flooded.
8. Fuel valve (if equipped) closed.
9. Engine not choked (if equipped with choke).
10. Burnt fuse. (Electric Start Only).
1. Spark plug boot loose.
2. Blocked fuel line or stale fuel.
3. Vent in gas cap plugged.
4. Water or dirt in fuel system.
5. Dirty air cleaner.
6. Unit running with CHOKE applied or in the
"ON" position (if equipped).
1. Engine oil level low.
2. Air flow restricted.
1. Spark plug gap too close.
1. Spark plug fouled, faulty, or gap too wide.
2. Dirty air cleaner.
Remedy
1. Engage blade control.
2. Connect wire to spark boot.
3. Fill tank with clean, fresh gasoline.
4. Prime engine as instructed in the Operation section.
5. Clean, adjust gap, or replace.
6. Clean fuel line.
7. Wait a few minutes to restart, but do not prime.
8. Open fuel valve. See engine manual.
9. Choke engine. See engine manual.
10. Replace fuse. (See Maintenance Section).
1. Connect and tighten spark plug boot.
2. Clean fuel line; fill tank with clean, fresh gasoline.
3. Clear vent.
4. Drain fuel tank. Refill with fresh fuel.
5. Refer to engine manual.
6. Put CHOKE in the "OFF" position..
1. Fill crankcase with proper oil.
2. Clean area around and on top of engine.
1. Adjust gap to .030". Refer to engine manual.
1. Reset gap to .030" or replace spark plug.
2. Refer to engine manual.
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