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back fire

Discussion in 'XJ Technical Chat' started by mustangc78, Aug 13, 2007.

  1. mustangc78

    mustangc78 New Member

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    My 650 special II is back firing out of the right cylinder while driving between 20 and 45. But only wih a constant throttle. Should I back the air mixture screws out or go in with them? The screw right now is 4 turns out.
     
    mustangc78, Aug 13, 2007
    #1
  2. RickCoMatic

    RickCoMatic Well-Known Member

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    Might not be related to Mixture at 4 Turns OUT.

    If anything ... that would be a tad Rich.

    Measure your Intake Valve Clearances and do a Compression Test.

    You might have a Tight Valve or a Burned Valve.
    Hope for tight!
     
    RickCoMatic, Aug 13, 2007
    #2
  3. mustangc78

    mustangc78 New Member

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    im running a bp7es spark plug. Should I go with a hotter plug? Will It help any?
     
    mustangc78, Aug 14, 2007
    #3

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