My name is Joel from Sydney and I'm trying to diagnose a strange problem on my bike. Apologies if this is the wrong forum to be asking this question I'm new to this forum.
Bike: GSXR K5 1000 Mods: Air-horn, Scorpio i900 Alarm, Akrapovic Carbon Slip-on, K&N Air Filter, Gilles Rear-Set, Aftermarket screen
Symptoms: If you have been riding the bike for most of the day, on a hot day (say 30C), the bike will sometimes turn off meaning that the engine stops the taco drops but all dashboard lights remain and no FI codes. Sometimes you get a few semi-stops before it does this where the power momemtarily drops out. It has been happening on and off for a while now (probably two years) but was previously so rare I didn't investigate it further. It can now be triggered relatively consistently. When it turns off the temperature of the engine will be around 100-105C (in the normal range) generally, sometimes even lower. If you attempt to start it straight away the starter motor will just click and then if you turn it off and then on after some minutes it will fire up again. The problem generally re-occurs if you try and keep riding after it has happened once unless you leave it.
What we have tried to fix: Performed a full service, checked valve clearances, replaced air filter, tightened all screws and checked everything around airflow and general bike cleanup. Also recently replaced the clutch cable. As far as I can tell the airflow is flowing perfectly well and the bike cools rapidly when accelerating, and the fan is coming on at around 104 as it should. Also checked the kickstand and ended up modding it slightly so there is a higher lean angle and so it doesn't bounce around and gave it a good clean. My mate who is far more knowledgeable than me gave it a really thorough clean.
What I suspect it is:
- Air Intake Temperature sensor might be faulty and when the air is very hot inside the airbox it is sending an incorrect amount of fuel
- Air Pressure Sensor likewise
- I considered killswitch sensor but I'm not sure the symptoms match
- I saw some people have had ECU issues but it seems weird an ECU problem would be so heat related
- With custom wiring possibly either the alarm or air-horn is shorting something when they get hot but this also doesn't seem to match the symptoms
Any advice of what to check? I'm a super-noob at these things. I tried checking the forums and while some people have had similar symptoms I didn't see anything that matched what I have.