Carb set up on Rn SJ - fouling rear plug

Discussion in 'Tech Discussion' started by steve K-B, December 8, 2010.

  1. steve K-B

    steve K-B Member

    Im having problems fouling up my rear plug on my twin carb SJ. it's a real pain and I've been trying to lean it off with the Low speed needle adjuster but no luck...
    I'm guessing I will need to replace the low speed jet or the spring but not sure what to do first. Not to sure what I'm doing with pop off pressures and all that.

    I'm also assuming it a low speed problem because when I open the throttle it will eventually clean it's self up the run sweet until it fouls with low speed riding.

    I want to get it sweet before I go putting higher compression domes in.

    Any input would be great.
  2. m-specs

    m-specs New Member

    check your popoff pressure check resistance in your leads make sure your compressions are good .... some where to start from...
  3. Aquanob

    Aquanob Active Member

    Cranks fucked
  4. tofa

    tofa Well-Known Member

    Try cleaning or replacing your needle and seat...You may find your rear carb is leaking and the extra fuel is wetting the plug and fouling

    So after youve taken Aquanobs advice and switched out your crank...Try giving the carb a good clean or if you dont think your up to it ring Roger and he maybe able to help.
    Also as the fisrt posted said...trim plug leads...check caps are on tight etc
  5. steve K-B

    steve K-B Member

    No sure about the crank but my tuefbis Prety worn so maybe start there?

    Thanks guys, its nice getting some helpfull info haha

    the leads are new as are the needle and seat and it's been pulled apart and cleaned regulary and recently.

    A little bird told me it may have the wrong jet in so I'll have a look this weekend and also check what you've all said.

    Will let you know what I find
  6. steve K-B

    steve K-B Member

    Does any one on the shore have a popped pressure gauge btw?

    Edit: Fucking predictive txt. I mean popoff pressure gauge...
  7. Aquanob

    Aquanob Active Member

    Bring that shitbox over and we will sort it out dryballs.
  8. T Bear

    T Bear Active Member

    is that an open invitation to all

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