• Battery connections are loose.
• Battery charge is low or discharged.
• Battery amperage is low.
• Starting leads are reversed.
• Fuse is blown in wiring harness.
• Key switch is wired wrong.
• Safety switch is malfunctioning.
• Wiring harness is wired wrong.
• Starting cable connectors are loose.
• Connectors are corroded or worn.
• Starter/Solenoid is malfunctioning.

• Electric clutch air gap wrong.
• Drive pulley is tightened against engine PTO face.
• Drive belt is wedged on idler pulley.
• Drive belt tension is adjusted too tight.
• Combustion chamber is flooded with oil/gas.
• Lack of oil in crankcase is causing seized engine.
• Drive shaft coupling is forcing engine shaft against internal thrust face eliminating crankshaft end play.
• Transmission brakes are too tight.

• Fuel tank is empty.
• Fuel hose is kinked or pinched.
• Fuel filter is clogged.
• Fuel valve is shut off
• Fuel solenoid is inoperative.
• LPG Regulator is not opening.
• Water is in fuel or fuel is stale.
• Wrong fuel (Diesel).
• Throttle control is in the stop position.
• Choke is not fully closed.
• Choke is on and flooding hot engine.
• Power take-off clutch stuck is on “on”.

• Safety interlocks are inoperative.
• Spark plug wire is disconnected.
• Spark plug is improperly gapped.
• Wrong type of spark plug is present.
• Wiring harness is not connected.
• Wiring is broken, loose or wrong.
• Transmission is not in neutral.
• Electrical clutch is not adjusted.
• Cranking speed is too slow to start.
• Spark plug is loose.
• Compression is low or absent.

• Spark plug gap is incorrect.
• Engine is not properly warmed up.
• Running out of fuel.
• Low idle is set too low

• Low idle fuel setting too lean.
• Electric clutch is dragging.
• Load is too large on the drive shafts.
• Crankshaft end play zeroed drive.

• Water is contaminating the fuel.
• Running out of fuel.
• Fuel mixture is too rich or too lean.
• Carburetor fuel solenoid is shorting.
• Throttle or choke is improperly set.
• Dirty carburetor needs cleaning.

• Kill switch is contacting intermittently.
• Key switch is malfunctioning.
• Safety interlock(s) are malfunctioning.
• Faulty fuse is in the unit control box.
• Leaking or worn valves are present in the engines.
• Shear pin is partially cut affecting timing.

• Improper ground is causing the battery to lose charge when accessories are activated.
• Faulty battery will not hold a charge.

Will not charge

• Regulator-Rectifier has failed.
• Regulator-Rectifier is not grounded.
• Flywheel magnet is not charged.
• Fuse is blown or circuit breaker is open.

• Regulator-Rectifier is burned out.
• Leads are pinched and are causing shorting.
• Alternator stator is shorted.

Electric clutch will not engage

• Wrong Regulator-Rectifier is used.
• Wiring is wrong or is not grounded.

Engine runs on when switched off

• Ignition grounding terminal or ground lead isnot connected at ignition module.
• Faulty switch.

• Running out of fuel.
• Running out of oil in the crankcase.
• Carburetor solenoid is malfunctioning.
• Key switch is malfunctioning.
• Safety interlocks is malfunctioning.
• Spark plug lead is loose.

• Fuse is blown in control box.
• Carburetor is out of adjustment.
• LPG Regulator is malfunctioning.
• Loss of vacuum to LPG Regulator.
• Tight drive belt is causing crankshaft bearing to seize.

• Overheated - cooling fins are clogged.
• Overheated - shrouding is blocked.
• Closed choke is flooding engine.
• Throttle is not in midway position.
• Throttle was left in stop position.
• Carburetor solenoid is malfunctioning.

• Fouled spark plug.
• Kill lead is shoring out.
• Ran out of fuel.
• Compression is lost.
• LPG Regulator is not functioning.
• Vacuum is too low to open LPG Regulator.

• Choke is not completely opened.
• Throttle control cable clip is loose.
• Throttle control is improperly installed.
• Fuel filter or line is clogged.
• Fuel is running low.
• Fuel pump is malfunctioning.

• Foreign material is in carburetor.
• Carburetor needs adjusting.
• Spark plug is gapped wrong causing intermittent firing.
• Drive system is binding up causing load on engine.