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Back Plug keeps fouling

Discussion in 'Motorcycle Tech Talk' started by gbob1, Oct 11, 2005.

  1. gbob1

    gbob1 New Member

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    i have a 97 wide gide 1340cc
    how can i stop my back plug from fouling out?
    the front plug is good
    a new plug well last about 60 mils and it's fouled out.
    Last edited: Oct 11, 2005
    gbob1, Oct 11, 2005
    #1
  3. Bulldog

    Bulldog New Member

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    You have other issues that is causing this. The rear cylinder runs hotter than the front because it doesn't get the airflow that the front does and it makes it easier to foul. Did you change the pipes or baffles without re-jetting? Are you jetted to rich?? Being too rich for long enough time can cause enough carbon to build up and then the valve can stick.

    Give me more info, i.e. is the plug fouling too rich or too lean

    [​IMG]

    or

    [​IMG]
    Bulldog, Oct 12, 2005
    #2
  4. navyman

    navyman New Member

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    Bulldog,
    Great looking bike. What model is that?
    navyman, Oct 12, 2005
    #3
  5. Bulldog

    Bulldog New Member

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    Believe it or not it is a 2000 Yamaha Road Star that I built myself. I punched the motor out to 131c.i. It is putting 148hp to the ground.
    Bulldog, Oct 12, 2005
    #4
  6. hotroadking

    hotroadking Super Moderator Staff Member

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    Remove the air filter cover and filter, bend down and look into the carb (from a distance don't put your face to the carb,

    Twist throttle, see if the pump is putting the stream right on the needle, or in your case possibly shooting fuel to the rear cylinder to the left of the needle.

    On a Mick you can adjust the pump by rotating it. Not sure on the cv if you can turn it easily to hit the needle but the stream of fuel should hit the needle straight on.

    Have you done any modifications to the carb or motor, is it stock?
    hotroadking, Oct 12, 2005
    #5
  7. gbob1

    gbob1 New Member

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    plug fouling

    it to rich but i droped down from a 175 jet to a 165 with no luck
    i have put in new seals around the intake
    the pips came on the bike but bafffles did not help.
    Last edited: Oct 12, 2005
    gbob1, Oct 12, 2005
    #6
  8. gbob1

    gbob1 New Member

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    i'v had it to a bike mach and he's baffled
    the bike ran good for about 2 mos in then this
    i have put on new cole and wires?
    im afrade im going to lean out the front plug
    Last edited: Oct 12, 2005
    gbob1, Oct 12, 2005
    #7
  9. Breeze

    Breeze New Member

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    Fouled plug

    I haven't seen a bike yet with that much difference in mix between front/rear cylinder. Are you sure you aren't having an issue with oil?... would expect to see exhaust smoke from that cylinder if this was the case. If it is actually that rich I would expect to see some black smoke from that cylinder when you hammer the throttle. If you are having a carb issue, it sounds as if some fuel is dumping into the manifold as liquid instead of atomized. Since you are moving forward (presumeably) inertia carries the heavier liquid fuel to the rear cylinder (in theory). I guess I would tear down the carb and be sure all jets are clear and that gaskets, diaphrams, pistons, etc. are in good shape... no tears, leaks and so forth. I'd be curious to hear what you find.
    Breeze, Oct 26, 2005
    #8

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