Starter Does Not Operate or Does Not Turn Engine Over
  1. Engine run switch in OFF position.
  2. Ignition switch not ON.
  3. Discharged battery or loose or corroded connections (solenoid chatters).
  4. Clutch lever not squeezed against handlebar or transmission not in neutral.
  5. Blown fuse.
  6. Security system armed or faulted. See dealer if faulted.
Engine Turns Over But Does Not Start or Starts Hard
  1. Fuel tank empty.
  2. Discharged battery or loose or damaged battery terminal connections.
  3. Spark plugs are loose, defective, fouled, have improper gap, or not according to specification.
  4. Spark plug coils are defective, have loose connection, or wiring in bad condition and shorting.
  5. Engine oil too heavy (winter operation).
  6. No output from ECM. See dealer.
  7. Inadequate fuel pressure in fuel lines (possible leak). See dealer.
  8. Clogged fuel filter. See dealer.
  9. Clogged fuel injectors. See dealer.
  10. Inoperative fuel pump. See dealer.
  11. Water or dirt in fuel system.
  12. Engine management system failure. See dealer.
  13. Intake manifold leak. See dealer.
  14. Tripped bank angle sensor. Turn key to OFF and then back to ON again. Start engine.
Starts But Runs Irregularly or Misses
  1. Spark plugs in bad condition or partially fouled.
  2. Spark plug gap too close or too wide.
  3. Battery nearly discharged.
  4. Damaged wire or loose connection at battery terminals or coils.
  5. Intermittent short circuit due to damaged wire insulation.
  6. Water or dirt in fuel system.
  7. Fuel level too low. Add gasoline.
  8. Inoperative fuel injector. See dealer.
  9. Obstructed fuel tank vent valve or pinched vent tube. See dealer.
  10. Engine management system failure. See dealer.
  11. Intake manifold leak. See dealer.
A Spark Plug Fouls Repeatedly
  1. Fuel mixture too rich. See dealer.
  2. Incorrect spark plug.
Pre-ignition or Detonation (Knocks or Pings)
  1. Incorrect fuel.
Overheats
  1. Insufficient oil supply or oil not circulating.
  2. Heavy carbon deposit from lugging engine. See dealer.
  3. Oil cooler obstructed.
  4. Cooling fan(s) inoperative. See dealer.
  5. Thermostat stuck closed.
  6. Plugged or restricted radiators or coolant lines.
  7. Air flow to radiators obstructed.
Excessive Vibration
  1. Engine mounts loose. See dealer.
  2. Swingarm pivot shaft loose. See dealer.
  3. Damaged frame. See dealer.
  4. Drive belt badly worn.
  5. Wheels and/or tires damaged. See dealer.
Poor Fuel Economy
  1. O2 sensor damaged or malfunctioning (engine running rich). See dealer.
  2. Clogged air filter.