Could someone shed some light on this issue, please? I bought the bike in second week of October, clocked about 2.5k km so far. The first service was done at 1.5k km. Initially the stalling would occur very rarely. I think the first random stall occurred at 700 or 1000 km, and another much later. I did not bother about it, thinking that the ecu update in the first service would fix the issue (as seen on various forums and YouTube videos). So, I did not even mentioned it to the service center. Later, the bike began to stall frequently, about 3-4 times in a 3 hour continuous ride. Then it would run fine for 2-3 days and then it would begin stalling again. The stall seems to happen mostly after downshifting to the 2nd gear and at a point where the clutch lever is neither fully released nor fully pulled in. Occasionally it does happen at other gears (down or up shifting), while the clutch lever is at the aforementioned position. I tried reproducing the issue intentionally but it did not work. The service center was unable to diagnose the problem since it occurs randomly, and it did not occur when I left it with them for 2 days. They had updated the ecu again, cleaned all the contact points, but to no avail. They asked me to pull the clutch all the way in any time I need to use the clutch, rather than half pull, to see if it solves the problem. That hasn't helped much either, the bike started stalling 2 days later.
I have done about 3,000 miles and only had one stall since the software update, in the same situation as you, changing down to second at slow speed. I've seen quite a few discussions about this, including a YouTube reviewer who had problems, some are more frequent, others don't have any stalling. Unfortunately, I think it may still be an unresolved problem.... although I can't update my experience at the moment as I crashed mine in September, and it is still in for repair!
I did not see that coming. Hope you get it back soon. The service centre has been quite helpful in this matter, taking feedback from each customer and trying to resolve the issue, rather than turning a blind eye to it.
This reviewer experiences the kill switch switching itself off (18.20). He says he had this happen 4 times when testing the Speed 400 and has heard of others having this problem. Triumph have even contacted him since the video was published. I wonder if the stalling is somehow related to a defect within the kill switch, as the bike won't "bump start" by letting the clutch back out when it happens, you need to stop, switch off and restart. I've needed to anyway, when it has happened to me. Just a thought!
I'd replace the clutch safety switch and try it with another installed. You could, as a test, create a fiddle loop to bypass the switch (assuming N/C) and then see if it occurs. I remember a time when we didn't have such switches and rolling it off the sidestand on the starter was quite possible..... apparently
I am able to start the engine after a second or so, without needing to turn the key off. I'll talk to the service guys about the kill switch, perhaps they might look into it.
