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I need some advice please. 2008 GSX-R600 race bike. Annitori quickshifter and Two Brothers Racing Juice Box fuel module. Everything else is stock. Engine idles fine and revs freely on the stands in the garage when starting cold. Gets to operating temp, cooling fan comes on as normal. Does not overheat (98-100 degrees). Turn engine off. Wait 10 minutes, start engine again. Idles fine, then engine just stops. Troubleshooting the following so far:
  • disconnected quick shifter and ran as OEM (no fix)
  • disconnected Two Brothers fuel module and ran as OEM (no fix)
  • replaced fuel pump and filter in tank (no fix)
  • Opened fuel tank filler while running in case venting blocked (no fix)
No fault codes appear.

Engine will stall at idle or with throttle slightly open. Only seems to happen after engine runs through a heat cycle first. On track it will only happen on lap 2 or 3. Bike is a rocket until this happens. When the engine stalls I can hear the fuel pump spin up to build pressure again. I'm thinking it's losing fuel pressure and causing it to stall. But why?

Any tips or advice will be appreciated. State championship racing in 3 weeks so the clock is ticking!

Cheers, Pete
 

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When it stalls, can you start it up again straight away, or does it need to cool down some? Also, when it stalls, does "CHEC" come up on the dash?
 

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Discussion Starter #3
When it stalls, can you start it up again straight away, or does it need to cool down some? Also, when it stalls, does "CHEC" come up on the dash?
No, it doesn't start again straight away and I think CHEC comes up. If I turn off the kill switch and ignition and leave it a few minutes then try again it will start. Today I tried cranking it as soon as it stalled and I got C12 (crank angle sensor). Once I left it a while and had it running again I also noticed the TPS marker while in dealer mode was _ rather than - where it normally is while running. Tried to crack the throttle slightly and it stalled again.
 

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I think I've found an issue. Crankshaft position sensor wiring was squashed between the lower radiator hose and engine block, melting some of the outer insulation on the wiring harness. Repaired and re-routed now with no repeat issues in the shed. Racing in three weeks so that will be the real test. Fingers crossed. Thanks for your reply.
 

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I've never had the C12 crankshaft position sensor error, so I only know what I have read on this site. Apparently they can fail when hot and cause hot starting issues. Sometimes it will throw a error code but other times it won't. The bike just stalls.
You can do a resistance test on the sensor using a multimeter, but because it's an intermittent problem, it can still be faulty. Metallic particles can also build up around the sensor and cause problems.

Hopefully yours was just a wiring issue. I would still check the connections of the sensor and the connections at the ECU. While you are there, measure the battery voltage with the bike running to check if it is not being over charged.

You can do a search of the c12 error using the search function on this site. I found this post from a few years back. He has a youtube video of the problem. In the comments section he mentions that replacing the CKP sensor fixed his issues.
GSXR dies after about 30 minutes. :(
 
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