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Thread: 2005 fireboltXB12R enige stops running

  1. #1
    Junior Member
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    2005 fireboltXB12R enige stops running

    new to Buells so twice last summer on hotter days 20 minutes into ride engine dies let it sit for 3/4 hr starts back up runs great finally have more time to trouble shoot going to check fuel pressure first then? thanks

  2. #2
    Senior Member Cooter's Avatar
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    Mileage? Mods? Condition? You gave almost zero info so I'll assume you tried to re-start immediately and it didn't work? Did it crank and no-start? No crank? Crank slow?
    Could you hear the fuel pump run (ignition on) before no-start?

    The only sensors that can kill the engine is the Bank angle sensor, side stand switch (if you have one) or temp. Temp could do it but it would run noticeably poorly first. You'd have limited RPM and even single cylinder shut down well before the ignition kill temp. Unless theres a very rare anomaly of it reading max temp instantly. A datalog would answer that (ECMDroid).

    Before you go googling a replacement sensors as a 100% guess, it's much more likely your ignition primary system is compromised. Fairly common on a 16 year old motorcycle that the connections and handlebar switches get corroded. Check fuses and relays (especially the IGN relay), sometimes just the act of wiggling to remove them and replace them is enough to help a 16 year old connection get continuity.

    Wiring diagram here:
    Buellmods.com

    Ya, ya. Check your grounds...
    Last edited by Cooter; 11-07-2021 at 08:10 PM.

  3. #3
    Senior Member squidbuellie's Avatar
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    Check for codes, if no codes.... probably the cam position sensor

  4. #4
    Senior Member Cooter's Avatar
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    Good guess, the CPS does like to fail with heat. You can test that guess with a heat gun or hairdryer in your garage.



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