Computer , is there better way to trick

Discussion in 'GS Boxers' started by JWL, Feb 6, 2013.

  1. JWL

    JWL Adventurer

    Joined:
    Nov 2, 2005
    Oddometer:
    16
    At the 40,000 km service on my 2005 1200gs the Dealer did some computer updates that appear to have added fuel shut off on overrun .
    ( update is K25 )
    This causes the bike to stumble on return to throttle and lean( noisy ) fire on shifting back gears .
    After the Dealer and BM Australia would do nothing I started fiddling with the throttle stop screws ( BBS ) and found that if I increased the idle speed with the LH BBS after I started the bike it would run fine again .
    Theory is that the computer does not sense a fully closed throttle and does not shut the fuel off in overrun situation .
    Problem is , have to re-do on every start and idle is bit high and iratic .

    Any suggestions appreciated , thinking of selling as riding is now annoying .

    John .
    #1
  2. JimVonBaden

    JimVonBaden "Cool" Aid!

    Joined:
    Feb 11, 2005
    Oddometer:
    64,826
    Location:
    Alexandria, VA
    There is no BBS on an R1200. I suspect you messed with the screw that adjusts the butterfly stops, and almost never need, or should be, adjusted.

    At any rate, first make sure you have the required 1mm slack in the cables at the throttle bodies.

    Fallow these instructions: http://www.jimvonbaden.com/R1200_TB_Sync.html

    Also make sure your throttle cable at the grip has slack.

    Do you have stock exhaust?

    Jim :brow
    #2
  3. JWL

    JWL Adventurer

    Joined:
    Nov 2, 2005
    Oddometer:
    16
    Thanks Jim ,
    Have has staintune from 20,000 km , have thought about trying the more restricted stock pipe , but all was fine until last service . ( will try )

    Cables etc adjusted , your corect , adjusted butterfly stop screw .

    Moving the thottle sensor position after starting the bike also fixes but also has some idle speed issues .

    regards
    John
    #3
  4. JimVonBaden

    JimVonBaden "Cool" Aid!

    Joined:
    Feb 11, 2005
    Oddometer:
    64,826
    Location:
    Alexandria, VA
    John,

    If your idle speed is increased, providing you have slack at the throttle bodies and the twist grip, it is likely that it can be fixed by disconnecting the battery cable for 10 seconds, then putting it back on. After that you turn the key to on, let the self checks complete, and twist the grip full throttle and back twice. This helps to reset the TPS so the idle will be correct.

    Also, you can do a stepper motor calibration by using a GS911. This should smooth out the idle. Then do another throttle body sync.

    Jim :brow
    #4