Jerk when decelerating in 1-2 gear - BMW S1000RR Forums: BMW Sportbike Forum
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post #1 of 29 (permalink) Old 06-08-2019, 09:24 PM Thread Starter
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Jerk/Surge? when decelerating in 1-2 gear

This has just recently started to happen a few days ago, when coming to a stop it like jerk/surge a few times. Any ideas on what this could possibly be?

Ok so I uploaded a better video which shows it surging/jerking a lot better

(Fixed) Front sprocket nut was loose creating movement in the front sprocket area

https://streamable.com/bmxwq

Better video below:
https://streamable.com/yoyyl

Last edited by xKtF; 06-30-2019 at 02:04 PM.
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post #2 of 29 (permalink) Old 06-08-2019, 09:26 PM
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This has just recently started to happen a few days ago, when coming to a stop it like jerks a few times. Any ideas on what this could possibly be?

https://streamable.com/bmxwq


Have you taken a look at chain? Make sure itís not too tight?

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post #3 of 29 (permalink) Old 06-08-2019, 09:27 PM Thread Starter
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Have you taken a look at chain? Make sure itís not too tight?
Yes I adjusted it today but still no luck.
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post #4 of 29 (permalink) Old 06-11-2019, 02:12 PM Thread Starter
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Posted a better video, anyone have any idea?
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post #5 of 29 (permalink) Old 06-11-2019, 04:34 PM
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Clutch issue?
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post #6 of 29 (permalink) Old 06-11-2019, 10:26 PM Thread Starter
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Clutch issue?
I've adjusted the clutch and still no luck. Kinda feels like a clutch/chain issue when it happens(atleast I think). Rear sprocket is good, gotta check the front tomorrow. Do you know if its possible for the gears to go bad and it only is one or does that not sound like the case?
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post #7 of 29 (permalink) Old 06-11-2019, 11:16 PM
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On the gears, if the teeth on one of the gears was somehow damaged you'd have the issue accelerating and decelerating, and if maybe the dogs were damaged the slip when they disengaged and engaged again would be (from what I can tell from the video) a lot more violent and probably something you could hear.

the_gooch is probably on the right track with it being a clutch issue, though I'm guessing he's talking about worn clutch plates? It's a little bit hard to tell in the video, does the engine speed change with the jerk? Any tight spots in the chain? Wheels rotate relatively freely/smoothly with the bike on stands? I know it's harder to test this, but is there any semblance of this issue in the higher gears?
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post #8 of 29 (permalink) Old 06-12-2019, 06:52 AM
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RPM looks to stay steady but sounds and looks like loss of power to final drive. I would look at the basket, springs and plates.
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post #9 of 29 (permalink) Old 06-12-2019, 06:54 AM
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Originally Posted by xKtF View Post
I've adjusted the clutch and still no luck. Kinda feels like a clutch/chain issue when it happens(atleast I think). Rear sprocket is good, gotta check the front tomorrow. Do you know if its possible for the gears to go bad and it only is one or does that not sound like the case?
There was a selector shaft issue but the bike would slip out of gear. I would open up the clutch cover and pull the clutch out.
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post #10 of 29 (permalink) Old 06-12-2019, 12:14 PM
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On second thought, have you checked with a GS911 for any codes being thrown first??
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