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).
Engine Turns Over But Does Not Start
  1. Fuel tank empty.
  2. Discharged battery or loose or broken battery terminal connections.
  3. Fouled spark plugs.
  4. Spark plug cable connections loose or in bad condition and shorting.
  5. Loose or corroded wire or cable connection(s) at coil or battery.
  6. Engine oil too heavy (winter operation).
  7. No output from ECM. See dealer.
  8. Inadequate fuel pressure in fuel lines (possible leak). See dealer.
  9. Clogged fuel filter. See dealer.
  10. Clogged fuel injectors. See dealer.
  11. Tripped bank angle sensor. Turn key to OFF and then back to ON again to start bike.
  12. TP Sensor/idle adjust screw not set properly. See dealer.
  13. Ignition not timed properly. See dealer.
  14. No output from CMP sensor. See dealer.
  15. Inoperative fuel pump. See dealer.
Starts Hard
  1. Spark plugs in bad condition, have improper gap, or are partially fouled.
  2. Spark plug cables in bad condition and leaking.
  3. Battery nearly discharged.
  4. Loose wire or cable connection(s) at one of the battery terminals or at coil.
  5. Engine oil too heavy (winter operation).
  6. Ignition not timed properly. See dealer.
  7. Water or dirt in fuel system.
  8. TP Sensor and/or idle adjust screw not set properly or misadjusted. See dealer.
  9. IAT or ET sensors damaged or malfunctioning. See dealer.
  10. Intake manifold leak. See dealer.
Starts But Runs Irregularly or Misses
  1. Spark plugs in bad condition or partially fouled.
  2. Spark plug cables in bad condition and leaking.
  3. Spark plug gap too close or too wide.
  4. Battery nearly discharged.
  5. Damaged wire or loose connection at battery terminals or coils.
  6. Intermittent short circuit due to damaged wire insulation.
  7. Water or dirt in fuel system.
  8. O2, IAT or ET sensors damaged or malfunctioning. See dealer.
  9. TP Sensor and/or idle adjust screw not set properly. See dealer.
  10. Fuel level too low. Add gasoline.
  11. Inoperative fuel injector. See dealer.
  12. Obstructed fuel tank vent valve or pinched vent tube. See dealer.
  13. Ignition not timed properly. See dealer.
  14. Intake manifold leak. See dealer.
  15. Interactive exhaust system not functioning correctly. See dealer.
  16. Air intake screen covered or restricted.
A Spark Plug Fouls Repeatly
  1. Fuel mixture too rich.
  2. Incorrect spark plug.
  3. Air intake screen covered or restricted.
Pre-ignition or Detonation (Knocks or Pings)
  1. Incorrect fuel.
  2. Incorrect spark plug for the kind of service.
Overheats
  1. Insufficient oil supply or oil not circulating.
  2. Heavy carbon deposit from lugging engine. See dealer.
  3. Ignition timing retarded. See dealer.
  4. Oil cooler obstructed.
  5. Cooling fan inoperative. See dealer.
Excessive Vibration
  1. Tie bar (engine isolation) mounts loose. See dealer.
  2. Swingarm pivot shaft loose. See dealer.
  3. Broken frame. See dealer.
  4. Front chain or links tight as a result of insufficient lubrication or belt badly worn.
  5. Wheels and/or tires damaged. See dealer.
Poor Fuel Economy
  1. O2 sensor damaged or malfunctioning (bike running rich). See dealer.
  2. Air intake screen covered or restricted.