Welcome to Our Community

Wanting to join the rest of our members? Feel free to sign up today.

Sign Up

98’ BigDog Vintage sport

Discussion in 'Vintage Big Dogs' started by Sctttllry, Jul 29, 2018.

  1. Sctttllry

    Sctttllry New Member

    Joined:
    Jul 29, 2018
    Messages:
    1
    Likes Received:
    0
    Trophy Points:
    1
    Location:
    Galt Ca.
    My Bike(s):
    BigDog
    First Name:
    Scott
    i am having issues all the sudden with sputtering. I have the S&S 107. I have drained my fuel tank, pulled the carb, still sputtering as I’m gaining speed. Then I lost all power, ended up being this little relay, sanded the contacts and now I have power, but still sputtering as if there’s either a loss of fuel or power. It also dies while I’m riding. Could it be my wiring harness? I have the Thunder Heart Performance Complete Electric Harness Controller. Please help
     
  2. HMAN

    HMAN Just like to ride
    Supporting Member Full Member

    Joined:
    Mar 21, 2011
    Messages:
    3,950
    Likes Received:
    3,334
    Trophy Points:
    113
    Location:
    Ks
    First Name:
    Harry
    Welcome from Kansas. Just for shits n giggles, check the top of ur carb for two rubber caps. If you see them, replace them. If they dry rot they will suck air and the bike will run like crap. Jm. 02
     
    PacoPetty, chubs and bigkelk9 like this.
  3. FrankBDPS

    FrankBDPS Well-Known Member
    Full Member

    Joined:
    Sep 7, 2013
    Messages:
    3,389
    Likes Received:
    3,171
    Trophy Points:
    113
    Location:
    North Lawrence,Ohio
    My Bike(s):
    2ooo ProSport 1997 Honda Night Hawk
    First Name:
    Frank
    Hello Scott, welcome to the forum. When you get a chance do an introduction and tell us about you're self and you're bike. There are a few of us on here who love our older dogs. If you think you are having a fuel problem start by turning off the gas at the valve under the left side tank. Then start by removing the fuel line from the carburetor. Now turn the valve back on. You should have a nice flow of fuel. If not open the left tank filler cap. Any chance in the fuel flow? If there is you have a tank venting issue. If there is still not much flow turn off the valve and remove the filter on the bottom of the valve and clean it. Also you may as well change the fuel hose from the valve to the carb. The ethanol in the gas may have caused it to fail. Also while you are at it change the hose that ties the two tanks together. Let us know if this helps.

    Can you post a pic of the relay you were talking about? I am wondering what exactly it was.

    Good luck!
    Frank
     
    BigDogRick, chubs and bigkelk9 like this.
  4. BigDogRick

    BigDogRick Active Member
    Full Member

    Joined:
    Sep 16, 2012
    Messages:
    698
    Likes Received:
    894
    Trophy Points:
    93
    Location:
    Phoenix, AZ
    My Bike(s):
    2000 Big Dog Vintage Classic, 2004 HD Fatboy, 2008 Jeep Rubicon, 1972 VW Bus
    First Name:
    Rick
    The "wearable" part of your EHC is actually the ignition module which is mounted forward of your Thunderheart EHC (with the sword emblem). It is also a Thunderheart ignition module. It wears out. The EHC is just a cluster of electronic alternatives to vintage relays. Check the spark output. The module is easily replaced or is by-passable to traditional EVO-style, nose cone mounted, cam sensor ignition module (such as Crane Hi4N or others.). This is an old thread and I hope my input is moot nd you are already on your way. If not, well here ya go.
     
    Butch Cassidy and chubs like this.
  5. BigDogRick

    BigDogRick Active Member
    Full Member

    Joined:
    Sep 16, 2012
    Messages:
    698
    Likes Received:
    894
    Trophy Points:
    93
    Location:
    Phoenix, AZ
    My Bike(s):
    2000 Big Dog Vintage Classic, 2004 HD Fatboy, 2008 Jeep Rubicon, 1972 VW Bus
    First Name:
    Rick
    I would suspect that Frank is right and that you have fuel flow issues out of your tank due to flakes of tank liner coming loose.
     
  6. BigDogRick

    BigDogRick Active Member
    Full Member

    Joined:
    Sep 16, 2012
    Messages:
    698
    Likes Received:
    894
    Trophy Points:
    93
    Location:
    Phoenix, AZ
    My Bike(s):
    2000 Big Dog Vintage Classic, 2004 HD Fatboy, 2008 Jeep Rubicon, 1972 VW Bus
    First Name:
    Rick
    Let us know if you have resolved the problem.
     
  7. byrddog

    byrddog Member

    Joined:
    Nov 28, 2011
    Messages:
    45
    Likes Received:
    24
    Trophy Points:
    8
    Location:
    mary esther, fl.
    My Bike(s):
    98 vintage classic, 2006 road king
    Could be old or bad plug wires also check contacts on ign. switch.
     

Share This Page