2nd time was recently as I ran into a traffic lighjt that turned red so I stopped (again from high rpm) and pulled the clutch and it stalled , didn't start when I was still moving so I pulled it over to the side, returned the key to off and then turned the key to on and restarted it normally.
This is a bit worse than what most people observe. The majority of bikes will always restart with the first touch of the starter button or even just by letting out the clutch to bump start.
These stalling issues some of you been having seems to be from a preignition snuffing the bike out. since these bikes are a fuel sipping bike the motor is running more lean air fuel mixture and with spark timing advanced and being a single cylinder they are more prone to a stall when unloaded quickly. Once the throttle is snapped closed and the clutch pulled in unloading the engine the motor seems to have a preignition causing the piston to stop and killing the motor. Now this is just my theory of what's been happening to some of you.
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The Following User Says Thank You to Shifty21 For This Useful Post:
These stalling issues some of you been having seems to be from a preignition snuffing the bike out. since these bikes are a fuel sipping bike the motor is running more lean air fuel mixture and with spark timing advanced and being a single cylinder they are more prone to a stall when unloaded quickly. Once the throttle is snapped closed and the clutch pulled in unloading the engine the motor seems to have a preignition causing the piston to stop and killing the motor. Now this is just my theory of what's been happening to some of you.
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Aye, I think this is a plausible explanation of what happens.
Clogged injectors cause it to behave like this too - that may not apply to all here
I've had this problem happen only once with my bike. Dirty fuel picked up at a highway bunk led to sluggish acceleration, poor low rpm performance and yes, stalling when going off the throttle. Possibly, not enough fuel being sent into the engine at low rpm leading to it leaning out and shutting off, before the O2 sensor had a chance to enrich the mix by opening the injector longer.
The problem was completely cured by cleaning the tank, the injector, and the fuel pump when I returned home. Cleaning the injector alone during the journey was a temporary fix which worked for some time only.
Though this may not help most who are having the problem, it may just be worth a try.
Gonna toss another 2 cents into the mix here. My bike stalled when I first got it and when the engine was not fully warmed up (and/or if it was cold outside). This went on for about two weeks. Started downshifting to slow the bike..through all the gears..and I have not had the problem again, even on the rare occasion where I don't engine brake. Until last week.
Last week I took my bike in for an oil change (5300 miles and it's close enough to the end of the season for me). It has stalled 3 times on me. I was able to immediately restart, but still. Also note that one of the stalls came immediately after pulling in the clutch lever. I was a little lazy in making my next downshift, pulled the lever, and the bike stalled before i was able to shift down. Thought about this thread at that moment. LOL
Rode the bike for another 60 or so miles on Saturday, accelerating briskly and downshifting for turns and stops and did not have a single stall issue. This leads me, again, to the idea that the ECU was re-set in the oil change process (I didn't ask if they disconnected the battery). I strongly suspect that, on MY bike, Shifty's theory was the likely source of the problem and that the ECU adjusted itself to correct the problem. Well, that's my theory on my bike. Hope it helps others.
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Had to get away to see what we could find
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I thought as much that the actual downshift has nothing to do with the stall but its the zero throttle and unloading of the engine that is causing the stall. Thanks MTC for your post.
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Last week I took my bike in for an oil change (5300 miles and it's close enough to the end of the season for me). It has stalled 3 times on me. I was able to immediately restart, but still.
Thick new oil is adding just enough additional drag to trigger the stalling event?
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