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missfiring cbr

Discussion in 'Technical and Troubleshooting Torque' started by gazza_55, Jul 4, 2007.

  1. This problem started virtually overnight.when the motor is cold it is a battle getting it started and when it does fire it has a miss until it warms up. Have changed plugs,new battery, cleaned and oiled k&n air filter checked choke adjustment.no difference. bike starts and runs fine when it's warm. any help appreciated.

  2. did you check the gap on the new plug before fitting?
  3. Sounds like it needs a carby clean and tune.
  4. Plugs were gapped as specified.Carby clean & tune looks logical
  5. Yep carbs. Sounds as if the idle circuit is lean or rich in a carb or two, and it's enough to throw it all out the window when cold.
    Probably find a good dose of Nulon Fuel system cleaner will help, as will an inline fuel filter if you don't have one.

    Regards, Andrew.