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Troubleshooting Guide
When troubles occur, be sure to check the simple
causes which, at first, may seem too obvious to be
considered. For example, a starting problem could be
caused by an empty fuel tank.
Some common causes of engine trouble are listed
below. Use these to locate the causing factors.
Engine Cranks But Will Not Start
1. Empty fuel tank.
2. Fuel shut-off valve closed.
3. Dirt or water in the fuel system.
4. Clogged fuel line.
5. Spark plug lead disconnected.
6. Key switch or kill switch in off position.
7. Faulty spark plug.
8. Faulty ignition module.
9. Choke not closing.
10. Faulty oil sending unit.
Engine Starts But Does Not Keep Running
1. Restricted fuel tank vent.
2. Dirt or water in the fuel system.
3. Faulty choke or throttle controls/cable.
4. Loose wires or connections that short the kill
terminal of ignition module to ground.
5. Faulty cylinder head gasket.
6. Faulty fuel pump.
7. Faulty carburetor.
8. Faulty fuel pump.
Engines Starts Hard
1. Hydrostatic transmission not in neutral/PTO
drive is engaged.
2. Dirt or water in the fuel system.
3. Clogged fuel line.
4. Loose or faulty wires or connections.
5. Faulty choke or throttle controls/cables.
6. Faulty spark plug.
7. Low compression.
8. Faulty Automatic Compression Release (ACR)
mechanism.
Section 3
Troubleshooting
Engine Will Not Crank
1. Hydrostatic transmission not in neutral/PTO
2. Battery is discharged.
3. Safety interlock switch is engaged.
4. Loose or faulty wires or connections.
5. Faulty key switch or ignition switch.
6. Faulty electric starter/starter solenoid.
7. Retractable starter not engaging in drive cup.
8. Seized internal engine components.
Engine Runs But Misses
1. Dirt or water in the fuel system.
2. Spark plug lead disconnected.
3. Loose wires or connections that intermittently
4. Engine overheated.
5. Faulty ignition module.
Engine Will Not Idle
1. Restricted fuel tank cap vent.
2. Dirt or water in the fuel system.
3. Faulty spark plug.
4. Idle fuel adjusting needle improperly set.
5. Idle speed adjusting screw improperly set.
6. Low compression.
7. Stale fuel and/or gum in carburetor.
Engine Overheats
1. Air intake or grass screen, cooling fins, or cooling
2. Excessive engine load.
3. Low crankcase oil level.
4. High crankcase oil level.
5. Faulty carburetor.
6. Lean fuel condition.
7. Restricted exhaust.
drive is engaged.
short the kill terminal of ignition module to
ground.
shrouds clogged.
Section 3
Troubleshooting
3.1
3
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