R1200GS Forum banner

spark plugs

  1. New Plugs - Rough Engine

    Maintenance and Modifications
    Based on one of the info pages here, I switched out the stock plugs on my 2009 1200 GSA with the NDK Iridium DCPR8EIX and took it for a test drive. Now my once smooth bike is running rough, missing and back firing; almost didn't make it home. Any thoughts? Seems like it is running on one...