999 Timing Gear Broke.

Discussion in '749 / 999' started by Sitodesmo, Jun 26, 2026 at 5:56 PM.

  1. Hi everyone!! I would like to know if anyone has had a similar problem. During my last track day, I had an issue with my 998S, which has a 999 deep-sump engine. Suddenly, the bike failed. After that, I tried to start it, but it wouldn’t start and was backfiring.

    I checked everything (pickup sensor, timing, injectors, etc.). Finally, I disassembled the stator cover and found three timing gear teeth (two from the primary gear and one from the pickup sensor gear). There are no other metal parts, just the teeth. The oil is perfectly clean, and the deep-sump oil filter is clean as well. Fortunately, the engine timing is still correct.

    Has anyone seen something like this before? I don’t know what happened…

    Thanks in advance.

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  2. Those are clean breaks. No sign of any foreign metal object in there?
     
  3. I haven’t seen absolutely anything. The oil is clean. I also took off the oil filter (deep sump), and it is perfect. Everything on the stator/engine side is normal. There are no metal parts or particles. Inspecting the gears, there are no unusual marks...
     
  4. Yikes. :astonished:

    I had some teeth off the 6th gear on my Monster's gearbox but that's more understandable given the loading involved but even though the timing gears are not as sturdy, there isn't much load going through them so I wouldn't expect that.
     
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