- If one plug is notably fouled and the other is normal(tannish over time) you are probably running on one cylinder.
- If you have a fuel programmer, first make sure it appears to be working correctly and then check that the piggyback connections on the injectors are tight.
- If all that seems fine(for now) trace back the wires from the injectors to the coils. make sure the electrical connections on them are tight(low amp ones). This problem has been reported previously on the forum.
- If all that looks good and still running bad and you have a programmer, remove it and go stock. If that makes the bike rideable then you have to troubleshoot the programmer which varies between models.