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Old 07-08-2013, 05:16 PM   #1
tustah
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WTF moment this morning on HOV

This morning after I got on HOV, I noticed my bike was accelerating very fast. Thought I was giving it too much throttle until I noticed my speedometer was in the 90s and the throttle was red lining. Even after shifting to neutral, it wouldn't stop.

Pulled to the side and hit the kill switch. Turned the bike on again and it did the same thing while in neutral. Waited a few more minutes and everything went back to normal.

The only thing I did was seafoam my bike two days ago. Also added some into the gas tank as well. I don't see this as the reason why the throttle would be stuck. Please correct me if I'm wrong. What are your thoughts?
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Old 07-08-2013, 05:41 PM   #2
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Sounds like your injectors been dirty or clogged and got cleaned back out. Computer might have to relearn. I'd disconnect the battery for an hour and let the computer reset. Might have to do it a few times if they are still cleaning out. You'll have to reset shift light.
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Old 07-08-2013, 05:49 PM   #3
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what kind of bike? FI or Carb?
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Old 07-08-2013, 06:00 PM   #4
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Quote:
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what kind of bike? FI or Carb?
google wiki says 2008 fuel injected..
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Old 07-08-2013, 06:03 PM   #5
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Quote:
Originally Posted by darranwil View Post
google wiki says 2008 fuel injected..
lol 2008 what? Are you going off of his list of bikes? I just wanted to make sure that was accurate before trying to help troubleshoot....

an FI bike should never surge like that unless the throttle cables are stuck or there are some major issues with the TPS, throttle bodies...
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Old 07-08-2013, 06:03 PM   #6
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Frayed or sticky throttle cable.
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Old 07-08-2013, 06:12 PM   #7
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Quote:
Originally Posted by BYRDMAN View Post
lol 2008 what? Are you going off of his list of bikes? I just wanted to make sure that was accurate before trying to help troubleshoot....

an FI bike should never surge like that unless the throttle cables are stuck or there are some major issues with the TPS, throttle bodies...
unless he's been running super lean for a while from clogged injectors. computer will compensate by increasing injector pulse voltage/widths. Gunk cleared out and then bike was dumping excessive fuel. Could be bad TPS like you said. Needs a reset but generally when a TPS is off it stays off...
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Old 07-08-2013, 06:14 PM   #8
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If throttle cable was stuck or frayed he would have to already lost the return throttle cable and been running on one.

Could also be a bad wiring harness connection on the computer/fuel injection system circuit. Had this happen to me.
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Old 07-08-2013, 06:15 PM   #9
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Dirty injectors or recently cleaned injectors causing the throttle to stick? Highly doubtful.
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Old 07-08-2013, 06:24 PM   #10
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Quote:
Originally Posted by maxgs View Post
Dirty injectors or recently cleaned injectors causing the throttle to stick? Highly doubtful.
Havent seen you in a while

I agree....
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Old 07-08-2013, 06:31 PM   #11
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We've had a bike come thru with a similar issue about a month ago. His throttle was actually sticking. Good thing you caught it safely and weren't hurt. Check all the above and get it fixed before going out again.
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Old 07-08-2013, 06:32 PM   #12
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It's a 2008 GSX-R750, fuel injected. Looks like this is worth having it checked out just to be sure. Thanks for the input.
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Old 07-08-2013, 06:35 PM   #13
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Cable
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Old 07-08-2013, 06:40 PM   #14
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This might be a long shot. Did you happen to install new grips recently?
I installed a new set and had the grip on the throttle slide move towards the bar end a little. There was friction between the grip and the bar end and that was causing the throttle to stick.
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Old 07-09-2013, 07:55 AM   #15
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^^^^ This. I would start with the grips as well. Had a new set of grips that were just a tad too long. Trimmed it back a hair and all was good.
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Old 07-09-2013, 09:01 AM   #16
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I had this happen on my bike when starting. That was because it was cold and computer had to relearn itself.
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Old 07-09-2013, 09:27 AM   #17
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Sticky throttle/Cable FTW!
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Old 07-09-2013, 11:19 AM   #18
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Did the bike not slow down when you tried to close the throttle?

Seems like closing it would be 2nd nature, and that twisting it shut would not be prohibited by a sticky cable. unless there is slack in the cable somewhere, or it is damaged, I guess.
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Old 07-09-2013, 12:21 PM   #19
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No new handle bars were placed on. I checked the throttle cable and it looks fine. Handle bar isn't sticking (pulled and released at all angles).

I went ahead and disconnected the battery terminal for a few minutes. Took it out for a quick ride and everything seems fine. Thanks for the input, fellas.
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Old 07-09-2013, 12:24 PM   #20
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Quote:
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Did the bike not slow down when you tried to close the throttle?

Seems like closing it would be 2nd nature, and that twisting it shut would not be prohibited by a sticky cable. unless there is slack in the cable somewhere, or it is damaged, I guess.
Closing the throttle was the first thing that I did. On my commute, I don't roll the throttle much, but it was rev'ing right at the red line point in 6th gear. When I turned it on again, it did the same thing. I waited a few minutes and things went back to normal.

Nothing looks damaged on the handlebar/cables.
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