Hi All, Some of you will have read my previous post about my issues with my 1198s Corse which mostly came down to the RR needing replacing. Now the next issue I have is stalling when hot. Following a good search about this issue, which seems to be a common gremlin, i bought an OBD device and lead to start trying resolutions with a TPS reset. Today was the day I had the parts and the time to take a look at it and I successfully connected my devices to the bike, reset the TPS and gave it a go to see if it would stall. It seemed all good for a while but then still stalled in the end. I used the loging feature on Scan M5X to keep a track of temperature and RPM which I've put a screen shot of below. As you can see I started logging data when the bike was just under 40 degrees and already the RPM is quite high, hovering around 1750. When the bike got to about 65 degrees the RPM went over 2k but then settled back down to hovering around the 2k mark. When the bikes fans kicked in though the RPM went really high, over 2.5k and then slowly but haphazardly dropped down until eventually stalling. There is one other point which is the fault readings, i had a few to begin with but werent sure how old they were and as I had been having problems in the past cleared them but got two news ones, both of which are showing ignition coil issues in each head. Again, the complete log is copied and pasted below for you. 04/08/2020 16:55 P0560:System Voltage Malfunction Low input; Warning lamp on *-- P0335:Crankshaft Position Sensor A Circuit Malfunction No signal; Warning lamp on *-- P0351:Ignition Coil A Primary/Secondary Circuit Malfunction Low input; Warning lamp on *-- P0352:Ignition Coil B Primary/Secondary Circuit Malfunction Low input; Warning lamp on *-- P0120:Throttle Pedal Position Sensor/Switch A Circuit Malfunction High Input; Warning lamp on *-- U1703 TC Unknow Low input *-- P0505:Idle Control System Malfunction No signal; Warning lamp on *-- ------------ 04/08/2020 16:56 : Erase No DTC found ------------ 04/08/2020 16:57 No DTC found ------------ 04/08/2020 16:58 No DTC found ------------ 04/08/2020 17:54 P0351:Ignition Coil A Primary/Secondary Circuit Malfunction Low input; Warning lamp on *-- P0352:Ignition Coil B Primary/Secondary Circuit Malfunction Low input; Warning lamp on Interested in the thoughts of the wizards out there! My initial thoughts are possibly about the airscrews on the throttle bodies, could it be the CO trimmer needs adjusting (currently set to 18), maybe the spark plugs or ignition coils needs replacing, I dont really know, pretty much clutching at straws!
Does it have a ICV idle control (stepper motor)? if yes blocck the air feed to see if theproblem goes, note it will need a bit of throttle to stop it dying, may be a clue, had similar on a Monsters evo
I hope you manage to find this quickly, the rpm rise coinciding with the fans coming on is a massive clue, says that the main fault has to be electrical for me. I think I would start by unplugging/inspecting/replugging all relevant connectors for starters if you haven't done so already. Relays in good order/replaced recently? Make sure ECU is earthed well, I just cured my intermittent problem with similar ECU by removing corrosion between heatsink and ECU body but this is an unlikely longshot if your bike is stored in the dry, cosseted and in generally fine fettle.
Interesting point, presumably to block the air feed into the stepper motor i could just clamp the tube from the airbox? I've just had a look at the raw data and there seems to be a 25 second delay between the fans coming on and the rise in RPM. I didnt realise there was such a gap when looking at the graph but I'll take a look through connections and such like anyway but my initial feelings is that this is something to do with air or fuel. I might also turn the fans on early during my next test and see if that makes any difference.
I have experienced rough and erratic running as a result of a stepper motor problem, but not followed by the stalling that you are experiencing. there is bound to be more help posted on the problem tomorrow.
If you are running the bike stationary and seeing all this odd behaviour just connect a meter across the battery and see if the charge is fluctuating in any way at the same time. I believe you said you had changed the rectifier but still worth looking
Yeah, i removed the voltage from the graph to make it clean but through the whole time the bike was on the voltage fluctuated between 14.1 and 14.3 volts. Its now got a MOSFET RR on it so should be good for a while.
Some of the things you suggested are worth working through. Definitely throttle butterfly balance/synchronisation and air bleeds. Nothing wrong with changing plugs and inspecting coils (particularly front) for moisture/corrosion. TPS and/or connector etc can play up and show these symptoms.
