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Old October 2nd, 2017, 08:31 AM   #1
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Unresponsive throttle

This was a weird one. I was planning to do a short tide yesterday with a friend. Met in a parking lot, fired up the bikes and hopped onto the highway. Everything seemed normal until I cracked the throttle open intending to leave all the cars behind. Nothing happened, the bike just continued on cruising as if I'd not provided any input. Didn't seem to matter which gear I was in, I could crack the throttle wide open with no real acceleration. Closing the throttle still produced the expected deceleration and engine braking however. I got off the highway and tried switching riding modes but the problem persisted. I shut the bike off and restarted it and everything was working fine again.

Given the bike is just back form it's 9k service I'm slightly concerned that an update to the ECU might be to blame. That said this has only occurred once, the bike rode fine when I picked it up Saturday and I spent an hour roosting around the city including letting the bike sit for 15 minutes at a cafe, the behavior never reoccured. I'll take it to the shop when they open Tuesday, but I'm wondering if anyone has run across this. I know there was an issue with the throttle on some bikes but mine is a 2015 so I don't think that is the case here. Definitely disconcerting to crack open the throttle and not have anything happen.
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Old October 2nd, 2017, 09:41 AM   #2
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TCU - you're going in and out of limp mode.
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Old October 2nd, 2017, 09:49 AM   #3
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Quote:
Originally Posted by appliance821 View Post
TCU - you're going in and out of limp mode.
I was wondering if that was limp mode. I didn't see a check engine light and the engine was running quite smoothly. After I restarted it the bike ran fine the rest of the morning and pulled as expected when I cracked the throttle open. It'll be curious to see what the shop says given that it was just in for service.
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Old October 2nd, 2017, 09:58 AM   #4
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Now that I think about it, this probably also is why the bike will stumble when cruising around 85 - 90mph. I'll just going along and it'll drop down to 80 as if I closed the throttle slightly and then jump back up to speed. Hopefully it doesn't take much to get them to replace it.
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Old October 2nd, 2017, 12:25 PM   #5
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I would get it replaced ASAP. I know someone who had a bad throttle and the result was unintended acceleration. He had to slam the brakes because the bike just wanted to lurch across an intersection.
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Old October 2nd, 2017, 07:11 PM   #6
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Limp mode wi;; seem smoother, and you'll be limited to about 55mph. If you're also having a problem at 80-90 - I agree with kuksul - get it looked at soon - and cover the clutch:-)
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Old October 3rd, 2017, 08:13 AM   #7
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The 80 - 90 thing is weird, but only seems to happen on occasion, it's also possible it's something else like the evap canister causing problems or something. I guess I was expecting limp mode to feel more like limping :-D I'll be calling the dealership to get an appointment today. Not being able to get out of my own way on the highway isn't my idea of a good time.
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Old October 3rd, 2017, 08:13 AM   #8
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Was it bogging when you went over certain throttle percentage?

Seeing how you had your 9K, I'll throw this out: I pinched my main fuel line when I reinstalled my tank after 9K/ RB work. Bike would run fine until a certain RPM/ throttle percentage, but it would dramatically bog at that point because it wasn't getting enough fuel. You can get a flash light in the trellis at the pivot point in the frame and check for kinks. Mine was a dramatic kink but yours may be less so.

Good luck.
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Old October 3rd, 2017, 08:16 AM   #9
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Quote:
Originally Posted by kuksul08 View Post
I would get it replaced ASAP. I know someone who had a bad throttle and the result was unintended acceleration. He had to slam the brakes because the bike just wanted to lurch across an intersection.
I'm curious about your friend's situation, and what the specific "bad throttle" issue was, if you're willing to share
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Old October 3rd, 2017, 08:22 AM   #10
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Quote:
Originally Posted by gatdammit View Post
Was it bogging when you went over certain throttle percentage?

Seeing how you had your 9K, I'll throw this out: I pinched my main fuel line when I reinstalled my tank after 9K/ RB work. Bike would run fine until a certain RPM/ throttle percentage, but it would dramatically bog at that point because it wasn't getting enough fuel. You can get a flash light in the trellis at the pivot point in the frame and check for kinks. Mine was a dramatic kink but yours may be less so.

Good luck.
It didn't feel like it was bogging down, it was strange. I'd be cruising at 85 - 90 in 6th just maintaining a pace. Obviously a bump here and there could cause subtle changes in speed but what I'd feel was almost as if I closed the throttle briefly, the bike would slow about 5 - 10mph and then pick it back up a moment or two later (maybe it was trying to drop into limp mode for a moment and then recovering?). If I dropped below 85 it wouldn't really be noticeable. Could be that above 85 I make a very good sail and any loss in power would be more noticeable. Could be nothing to do with the TCU but I'd be happy if it was resolved.
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