Plug color half and half....

Discussion in 'Sportster Models' started by Lang, Jul 25, 2011.

  1. Lang

    Lang Member

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    hi everybody, quick question.... my front spark plug was half too rich and half just getting some color but very little. i never saw a plug that was half and half. i thought maybe manifold leak but i tried all the tests and did not find one. anyone ever seen this? or did i discover something new. thanks
     
  2. Hoople

    Hoople Account Removed

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    I have seen the 1/2 plug coloring also. A big portion of that is caused by the E10 fuels of today. You just can't read plugs anymore like we use too. I have changed the air/fuel ratio by 2 FULL ratio points and saw next to nothing in color change of the plugs.

    I know for a fact my engine is running right on the money but yet the plugs "indicate" my mixture is lean. And believe me it is Not. I no longer see those nice brown/tan plug colors anymore.