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308 carb question

Discussion in '308/328' started by johnvwatts, May 14, 2010.

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  1. johnvwatts

    johnvwatts Formula Junior

    Jul 7, 2007
    522
    England
    Full Name:
    John v watts
    #1 johnvwatts, May 14, 2010
    I have a problem with one plug wetting. It is not an ignition issue or a plug issue (done that). Is it possible that there is an internal carb sealing failure whereby petrol can bypass for one cylinder but not the other ? If the float was sticking then surely this would affect two cylinders? Any thoughts appreciated.
     
  2. johnvwatts

    johnvwatts Formula Junior

    Jul 7, 2007
    522
    England
    Full Name:
    John v watts
    #2 johnvwatts, May 22, 2010
    Still doing it . Any thoughts . Anyone?
     
  3. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,324
    UK
    #3 Iain, May 22, 2010
    If you are sure its not an ignition issue then I'd be tempted to have the carb off and strip it & rebuild it. The postential damage that can be caused by a bad carb washing the bore with neat fuel is not funny - and it can happen in 3-500 miles.

    I had it happen a long time ago straight after a rebuild when I skimped & just stuck the old carbs back on. Cost me a rebore and new pistons (Not on a Ferrari fortunately!).
     
  4. johnvwatts

    johnvwatts Formula Junior

    Jul 7, 2007
    522
    England
    Full Name:
    John v watts
    #4 johnvwatts, May 22, 2010
    Good point. I think the carb will have to come off asap!
     
  5. chrismorse

    chrismorse Formula 3

    Feb 16, 2004
    2,150
    way north california
    Full Name:
    chris morse
    #5 chrismorse, May 22, 2010
    Last edited: May 22, 2010
    Before you pull it, you might check the AC/Emulsion tube/Main jet assembly for correct jetting and tightness, make sure the idle mixture screw is adjusted the same as the others. The cold start mechanism might be sticking open a bit ?
    Just to double check the whole secondary side, pull the plug, connect the wire/extender, ground the plug and turn it over to confirm the ignition on that cylinder.

    good luck,
    chris
     
  6. johnvwatts

    johnvwatts Formula Junior

    Jul 7, 2007
    522
    England
    Full Name:
    John v watts
    #6 johnvwatts, May 22, 2010
    Thanks Chris. Bit of a breakthrough. If I screw the idle jet right in , then open 1/2 turn the problem stops. All the other idles are three turns out. Same size jet (50's) - either not seating properly or some **** has drilled it larger. Will try another idle in it tomorrow.
     

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