Dead throttle and stall after rapid acceleration

[AZPI]

I was on a brief ride today and did a two moderately rapid accelerations onto on-ramps up to 75mph about a minute apart from each other. After the 2nd acceleration I took the first exit about 1/4 mile away and as I exited my throttle had nothing behind it, it didn't raise the rpms at all. The handgrip moved loosely with no resistance and as I decelerated to 45mph the bike stalled. I pulled the clutch lever, hit the start button and it fired right up and went completely back to normal.

I rode home a couple miles without issues. I lucked out because I was able to exit immediately. Had I been in the far left lane there could have been trouble.

Any ideas what happened here?

Two weeks ago I swapped handlebars, no issues until today. Earlier in the ride I switched back and forth from Sport to Touring multiple times and was in Sport when this happened.

2016 S10 (not ES) Thanks in Advance!

 

[Nikolajsen]

The handgrip moved loosely with no resistance

:question:
Do you mean, that you could give trottle, but rpm did not raise, and it felt like the "flap" in injection did not move, like it was completly open?
And what was rpm at this point? normal idling or was the engine already stopped at this point?

 

[mebgardner]

Did you disconnect the battery when you performed your bar service?

I suspect loose battery connections, or a not quite seated connector on a bar switch.

 

[AZPI]

:question:
Do you mean, that you could give trottle, but rpm did not raise, and it felt like the "flap" in injection did not move, like it was completly open?
And what was rpm at this point? normal idling or was the engine already stopped at this point?

There was no rev or acceleration when I turned the throttle handgrip. The throttle handgrip was far looser than normal but it did snap back closed only slower. The rpms seemed to be normal idle once I noticed the issue but on the I-10 in downtown Phoenix I was more focused on the traffic behind me and getting my bike to respond. The loose/dead throttle only happened long enough for me to give the throttle a couple turns before the bike died and then the successful restart.....2-3 seconds.

I couldn't tell you what it feels like when a flap in injection doesn't move or like it was completely open. I just don't have that knowledge so hopefully my answer covers that. Thank you for the reply!!

 

[AZPI]

Did you disconnect the battery when you performed your bar service?

I suspect loose battery connections, or a not quite seated connector on a bar switch.

I didn't touch the battery during the bar swap. A poorly seated connector on a bar switch is a good point! I haven't opened anything up on the bars yet but I'll definitely consider that! Thank you!!

 

[Nikolajsen]

Very strange...
It almost sounds like the cable was stuck...BUT then the rpm should have been higher, similar to where the cable is stuck.
When you check connectors, also check routing of the 2 cable to throttle.

 

[2daMax]

Happened to me on my 2012 and in S mode. TB sync with reference screw half turn out cures it forever.

 

[Nikolajsen]

Happened to me on my 2012 and in S mode. TB sync with reference screw half turn out cures it forever.

WHAT... ??? really? How can that influense the "feeling" of the throttle, and causing the engine to not take rpm..
I of course believe you...

It's just that I might have to rethink my troubleshooting....I am used to a 2006 TransAlp, with carburator, and absolutly no fancy electronic...except HISS

 

[scott123007]

The handgrip moved loosely with no resistance and as I decelerated to 45mph the bike stalled. I pulled the clutch lever, hit the start button and it fired right up and went completely back to normal.

Any ideas what happened here?

2016 S10

If your description above is the "exact sequence" in which it happened and what you did, you inadvertently hit your kill button. There is no way your bike will die in gear at the speed you were going, and then just by pulling in the clutch and hitting the button, start again, unless you bumped your kill switch. Since 2014 the kill switch and starter switch became one unit, so by re-starting your bike with the button, you turned it back on as well as re-started it.

 

[Checkswrecks]

If your description above is the "exact sequence" in which it happened and what you did, you inadvertently hit your kill button. There is no way your bike will die in gear at the speed you were going, and then just by pulling in the clutch and hitting the button, start again, unless you bumped your kill switch. Since 2014 the kill switch and starter switch became one unit, so by re-starting your bike with the button, you turned it back on as well as re-started it.

LOL - I've done that. And then there's the "game" of whacking the kill switch on another guy as you pass.


If that's not it, then there really isn't enough here for a real diagnosis.

 

[Sierra1]

Had similar experiences with the ST1300. Hard acceleration after starting the bike, followed by a throttle close in the first 100 yards, would kill the engine. It would start right up and not do it again; until after sitting again. My buddy's bike would NOT do the same thing. (twin to my bike) Two different techs were unable to diagnose/fix the problem. I just learned to live with it.

 

[AZPI]

TB sync with reference screw half turn out cures it forever.

Please walk me through what you're talking about here. TB sync? Reference screw? No idea what or where those are but I'm all ears!

 

[AZPI]

If your description above is the "exact sequence" in which it happened and what you did, you inadvertently hit your kill button. There is no way your bike will die in gear at the speed you were going, and then just by pulling in the clutch and hitting the button, start again, unless you bumped your kill switch. Since 2014 the kill switch and starter switch became one unit, so by re-starting your bike with the button, you turned it back on as well as re-started it.

I hope you're right, that's for sure! I am certain the throttle was "dead" before it stalled. But again, there was a lot going on so who knows. I did just buy new gloves a couple weeks ago......hmmmm.

Thank you for your input, I really appreciate it!!!

 

[Checkswrecks]

Please walk me through what you're talking about here. TB sync? Reference screw? No idea what or where those are but I'm all ears!

SEARCH is your friend. The Throttle Body Sync threads are stickied here:
http://www.yamahasupertenere.com/index.php?board=78.0