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Thread: Problem with S & S Super E "Shorty" Carburetor on '67 FLH

  1. #1

    Default Problem with S & S Super E "Shorty" Carburetor on '67 FLH

    I've owned this bike for a year and put 2,100 trouble free miles on it. A couple weeks ago while riding on a country road it started missing, sputtering, blubbering when giving it throttle. First I thought it was a plug wire off or something causing a bad miss. When I got pulled over found nothing wrong with plug wires. It would start and idle, but stumble and cough and spit as soon as you gave it throttle. I finally discovered gas dripping out of the air cleaner cover. Took the air cleaner off and found no external leaks, no float bowl overflow. But looking down the throat could see gas spurting out of the main jet discharge tube as soon as I twisted the throttle. Obviously way too rich to run right and excess would drip out the backplate. With no real experience on carburetors I studied the S & S book, did some on line research, and talked to S & S technical support. They thought doing a rebuild kit should solve whatever the problem was. So I took it apart, did a Berryman Chem Dip cleaning routine, and installed every new part from an S & S Master Rebuild kit. Coming apart there did not appear to be anything out of line, and everything went back together very smoothly. Also put in new spark plugs in case the old were fouled. Back on the bike, it's doing the exact same thing. It has a .070 main jet and .0295 intermediate jet, which are appropriate for the 74" motor. I called S & S technical again and they were baffled. And so am I...any insights as to what to do would be greatly appreciated.

  2. #2
    Join Date
    Sep 2005
    Location
    Sarasota, Florida
    Posts
    4,178

    Default

    I had that problem due to a bad condenser.
    Eric Smith
    AMCA #886

  3. #3
    Join Date
    Sep 2005
    Location
    Sarasota, Florida
    Posts
    4,178

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    It's funny that no one on these forums ever says, "it turned out to be the condenser". I think I must be the only person that ever had that problem
    Eric Smith
    AMCA #886

  4. #4
    Join Date
    Dec 2001
    Posts
    434

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    No your not Eric. I don't no why one would tie a bad condenser to a problem with the carb but I always carry a couple of spare condensers with me in my tool kits on all my bikes that use them. Maybe because it's not firing properly the carb can't use the fuel? Is that what your saying? I've had a few friends with generator Shovels that have ate condensers but my '67 hasn't had that problem. I've lost one on my EL though. It would start but not take throttle.
    DrSprocket

  5. #5

    Default

    Thanks Eric. I began to think it was something other than carburetor, but with my limited mechanical knowledge I had no idea where to start. I'll change the condenser and let you know.

  6. #6
    Join Date
    Aug 2012
    Location
    Victoria, Australia
    Posts
    182

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    Isn't there an expression that goes "99% of carb problems are ignition" or something similar?

  7. #7

    Default

    That's as logical an explanation as any at this point. Especially since I feel as though the carb has to be perfect after the rebuild. Thanks for the input.

  8. #8
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    4,342

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    Quote Originally Posted by Peter Cooke View Post
    Isn't there an expression that goes "99% of carb problems are ignition" or something similar?
    Close, Peter!

    It should be "99% of carb problems are vacuum leaks."

    Carbs are forgiving.

    Manifolds are evil.

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  9. #9
    Join Date
    Apr 2010
    Posts
    1,124

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    turning the throttle causes the accellerator pump to squirt..not the main nozzle.I'm sorry but you just ran in a circle for no reason.

  10. #10
    Join Date
    Apr 2010
    Posts
    1,124

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    29.5 slow jet is too large for most 74" motors & 70 is too large for the main on a shovel unless stroked..try 28 & 68....but that is not your current problem.This could be,condenser,points,advance mechanism,overcharging.....put a timing light on it a rev it while watching the light flash to see if the miss matches the firing
    Last edited by duffeycycles; 07-07-2018 at 10:40 AM.

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