u/GlitteringCancel5019

Hi everyone,

I’m looking for some help diagnosing a problem with my 2009 BMW S1000RR (K46).

The bike recently started behaving strangely and I’m not sure where to start looking.

What happened:

• Initially, the bike would start normally in neutral.
• As soon as I put it into 1st gear, the engine would immediately stall.
• At that point, the bike would not start with a gear engaged, only in neutral.
• After trying a few times, it eventually started and I was able to ride it.

However, while riding I noticed another problem:

• The throttle response was very inconsistent.
• When accelerating, it felt like the engine was repeatedly cutting in and out:
  • power comes on
  • power disappears
  • power comes back
  • power disappears again
• It felt almost like the bike was intermittently losing throttle/fuel/ignition rather than simply running poorly.

Then, when I pulled the clutch in, the engine stalled again.

So the combination of symptoms is what really confuses me.

I’m wondering if this could be related to:

• clutch switch / sidestand switch
• clutch adjustment or clutch not fully disengaging
• throttle position sensor / throttle system
• fuel pump / fuel pressure
• ignition coils
• wiring/electrical issue
• ECU detecting an implausible signal and cutting the throttle
• something else specific to the K46

The bike is a 2009 model, so it is one of the early K46 bikes.

Has anyone experienced this exact combination of symptoms or worked on a K46 with similar behavior?

I have already been to an official BMW shop, although they couldn't replicate the problem thus not help.

I’d really appreciate any suggestions on where to start diagnosing it and what I should check first. I’m happy to provide additional information or test specific things if someone can guide me through the diagnosis.

Thanks in advance!