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Was looking for follow-up from Stuart Fillingham as he'd mentioned communicating with Triumph about the gearbox issue. He'd removed that video post and placed this link in the original video about it. The attached is a service bulletin from Triumph. There are three bulletins but only one for the gear box selector shaft and the updated parts replacement kit if you should require one.
 

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I saw the same video last night. Very disconcerting. I have a 2016 T120 with 8,000 miles and have had no issues, but like you, I now wonder whether it's just a matter of time.
It happened to me when my 2016 T120 stopped downshifting at about 6,500 miles and just under two years of ownership. The timing was superb. My dealer had the problem fixed about two weeks before the warranty ran out. No problems since.

I suggest it's not worth not worrying about. It'll happen or it won't, and chances are good that it won't. Just enjoy the bike. If the bike does stop downshifting, it's worth asking the dealer and Triumph to cover the repair at no charge as a matter of customer goodwill.
 

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Was looking for follow-up from Stuart Fillingham as he'd mentioned communicating with Triumph about the gearbox issue. He'd removed that video post and placed this link in the original video about it. The attached is a service bulletin from Triumph. There are three bulletins but only one for the gear box selector shaft and the updated parts replacement kit if you should require one.
Its still far from clear which actual parts on the selector shaft have been modified/updated, for example is the pivot plate on the updated shaft different to the one you can buy as a single item, if so can you just buy that or won't it fit the original shaft?
Its a pity we can't seem to get any specific information from triumph about what they think the issue is and how they plan to solve it.
Also I think at least one member had this updated shaft fitted and still had a repeat failure so its not the final solution.


Interesting looking at the other service bulletins that Triumph now use a "seal mate" type tool to clean the fork seals.:)
 

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Thanks for locating the video @Singlin This isn't a a job for a novice mechanic IMHO.
Yes and no, there's no specialist tools or knowledge required, its just a matter of taking things apart and putting it back together carefully, but if watching the video puts you off rather than encourages you to have a go then its probably a wise decision to leave it to a professional.
There was only one stage I found a bit fiddly more than anything, that was refitting the clutch outer basket/sleeve while juggling the starter gears, also all my gasket remained stuck to the engine side and was a pain to scrape off without dropping any bits in the engine (or damaging the case).
I'll concede I do similar jobs at work and I've twice removed my Daytona clutch and gearshift before which is basically the same unit.
 

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Man... Late to this party... Been out riding, Need to spend some time on the forum these days...
So My Transmission went at 20K miles. 74K miles on the bike now (or 54K on the new transmission) and I have had no issues. Bike is starting to get funny acting in it's older age. I mean it's not "old" 2018 but the miles are there...
 

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Hi Jedz123. I understood your gearbox (6th gear wasn't it?) crapped out, not just the selector mechanism? Also, have you ever had any issues with the said selector mechanism which some are experiencing?
 

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My selector broke at 12K miles when I was riding in the middle of nowhere and I repaired the issue out of a local shop by welding some of the components back together. The bike ran for another 8K miles before 6th gear grenaded due to output shaft bearing failure and poor metallurgy on the 6th gear. The originally repaired shifter I mended is still in the bike with 62K miles on it. The folks at the Dealer did mention in saying that my rebuilt selector was far more robust than the stock one, I told them what happened (bike fell and shifter just spun around and around) and they were impressed to see someone able to do a better job than factory at the time. Triumph was sure the output shaft failure was unrelated to my shifter and I'm still using my rebuilt one today...

I'll roll 74K miles by end of day today... I would trust this bike to go across country at this point. It's been a tough bike since the rebuild.
Cheers.
-Jedz
 
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Nice to know mate. If you have any more info on how & what bits you welded together would be cool to know as well
 

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I replaced my shift assembly last weekend, a relatively straightforward process. Keeping the oil pump chain in place was about the only tricky step.

After only 5,000 miles, and never dropped, here’s what mine looked like. Completely unacceptable in my view.

740280

740281

Kevin
 

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Dude... that's not acceptable
 

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I replaced my shift assembly last weekend, a relatively straightforward process. Keeping the oil pump chain in place was about the only tricky step.

After only 5,000 miles, and never dropped, here’s what mine looked like. Completely unacceptable in my view.

View attachment 740280
View attachment 740281
Kevin
Had it stopped shifting at that point?
The "wear" on your pivot plate looks different than mine and the others I've seen, like a piece has chipped off on that LH side rather than worn down.
 

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Had it stopped shifting at that point?
The "wear" on your pivot plate looks different than mine and the others I've seen, like a piece has chipped off on that LH side rather than worn down.
Yes, it wouldn't downshift

Kevin
 

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I replaced my shift assembly last weekend, a relatively straightforward process. Keeping the oil pump chain in place was about the only tricky step.

After only 5,000 miles, and never dropped, here’s what mine looked like. Completely unacceptable in my view.

Kevin
FWIW, I had the opportunity to inspect the same assembly when it came out of my bike after the transmission stuck in sixth gear at about 4,500 miles. It looked perfect, with no damage or wear. The problem seemed to be somewhere else, but the shifter shaft and everything attached to it was replaced anyway under warranty. This was the only work done other than disassembly and reassembly. Somehow, the problem got fixed and I've had no more problems since. I have an early 2016 T120.
 

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2017 Street Scrambler, 2014 Honda Grom
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2017 Street Scrambler, bought it with 370 miles on it last October (2020) and it started refusing to downshift in May with ~1300 miles on the clock.
2.5 months to solve the problem, but it's seemingly all fixed now, and with new ECU maps installed is FINALLY running like it should be. The Triumph dealer closest to me is appointment only due to covid, and the earliest appointment was 5 weeks out. Dropped off the bike, gave them all the info from this thread and had them look up the TSB. Had misfiring problem fixed as well with the updated spark plug caps, plugs (due to arcing), and ECU maps, oil change. Supposedly they took it for a test ride after oil change to see if that'd solve the shifting issue and said it was fixed. I picked it up a week later and when driving off the lot it immediately was apparent the shifting issue was NOT fixed. Turned right around, talked to the shop owner, who rode it himself and agreed. We ordered the newest iteration of the shift shaft kit (version 3) which took ~10 days to get there. No "good will" repair from Triumph as it's a 4 year old bike now and I'm the 2nd owner. Total cost ~$450 for just the shift repair. Another ~$500 for the rest. As you may understand this was a bit disheartening and I've considered not keeping the bike if it's going to continue to need costly repairs, but here's hoping for the best.

Just picked up the bike Friday and all seems well. Shifted perfectly for the 50 miles I've ridden it so far and is much smoother with the ECU updates.
Just wanted to thank everyone on this thread for the vital info regarding this problem and hoping others out there have less issues! I'll update with any future problems, thanks all!
 

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Does anyone know the part number and any info on the "newest iteration of the shift shaft kit (version 3)"?
 

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Heres what I ordered from Triumph in November 2020 when I started looking in to the pivot plate, comes in kit form so you get the selecter shaft and the pivot plate fully assemled, dont know if its latest revision part number, would have to ring the dealer and ask.
 

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That's the same part that failed me after over 1000kms last year.
I would be curious to know if their is another updated part after the T1191968 one.
 

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T1191968 has been superseded by T1191977
 
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