Section 6: Troubleshooting - MTD 650 Series Operator's Manual

SECTION 6: TROUBLESHOOTING
Problem Cause
Engine fails to start
Engine runs erratic
Engine overheats
Idles poorly
1. Spark plug wire disconnected.
2. Fuel tank empty or stale fuel.
3. Throttle control lever not in correct
starting position. (If Equipped)
4. Blocked fuel line.
5. Faulty spark plug.
6. Engine flooded.
1. Spark plug wire 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. Carburetor out of adjustment.
1. Engine oil level low.
2. Dirty air cleaner.
3. Air flow restricted.
1. Spark plug faulty or gap too wide.
2. Carburetor improperly adjusted.
3. Dirty air cleaner.
Remedy
1. Connect wire to spark plug.
2. Fill tank with clean, fresh gasoline.
3. Move throttle lever to start position.
4. Clean fuel line.
5. Clean, adjust gap, or replace.
6. Wait a few minutes to restart, but do not
prime.
1. Connect and tighten spark plug wire.
2. Clean fuel line; fill tank with clean, fresh
gasoline.
3. Clear vent.
4. Drain fuel tank. Refill with fresh fuel.
5. Replace air cleaner.
6. See authorized service dealer.
1. Fill crankcase with proper oil.
2. Replace air cleaner.
3. Remove blower housing and clean.
1. Reset gap to .030" or replace spark
plug.
2. See authorized service dealer.
3. Replace air cleaner.
NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service dealer,