How much lash in the drive train is normal?

Looks like it was the rear bearing that failed. It was the front bearing that was sometimes installed backwards. Can't tell from the picture if your is on correctly. They use a sealed bearing on the rear now. The early open bearings were supposed to get splash oil from the gearbox but didn't usually get enough.

@Steel probably wouldn't have a problem running the old open bearing in the rear.
 
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Since its a 06 and obviously old style bearings. If they are changing both helical gears they most likely will split the engine open to pull the transmission output shaft. You should seriously, seriously, seriously (get the point) have them change the second gear, dog ring, and the newer style splined bushings that have the splined washer on it also. And they should check to insure the cir clips are orientated correctly. some of them were not and can cause catastrophic failure. It beats taking the engine back out to do it later!!!!!!
 
OK I am not sure if your using a Triumph shop or someone else but to help clarify the front torsional damper bearing and why it failed here is a few pictures. Below is the front bearing but installed arse backwards it only has one seal and should not be installed like the picture below . The seal is towards the front so oil cannot be fed to it. If the rear one is ok I would change it as it won't be for long its hopes God will deliver the oil to it . Like Fred said the new rear bearing is double sealed and packed with grease.




That being said Below is the bearing installed correctly allow oil to be fed to it.




If it were my bike besides installing the new updated second gear and dog ring, and Splined bushings I would also install the updated detent wheel.
 
Thanks warp, I told them to change both bearings to be sure. Does the engine have to be split to change that helical gear thats damaged?

In that case I will get them to change the other parts you recommended as well. I dont suppose you have part numbers for all the bits needed?

Thanks for the advice

And is it worthwhile renewing all the circlips on the gear shafts just to be sure or will they be okay to be reused? It is a triumph dealership doing the work.

The detent wheel seems to be T1190004, second gear and dogring come as a kit, part number is T1180188, but I am not sure what the part number is for the splined bushings and how many of them are required. And is the splined washer part of the splined bushing or is it another separate part?
 
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I can put a list together for you or send you the PDF file on the update kit it has all the part numbers As for changing the helical gear without pulling the motor let me give it some thought I believe you can since the engine is out of the bike but let me look at how we are going stop the shaft from rotating as the torque on the nut is 145 NM.

PM me your e-mail address.

Oh and about the cir clips it depend on whether they stretch them to far pulling them but in if you end up splitting it open I would. They cannot be that expensive its just a snap rings I'm not sure where they came up with the name cir clips might be back to them not chilling their beers properly
 
Thanks, I have sent you my email address I think, started a conversation if thats what you mean by pm with my details in it.
 
Good news I get the bike back on friday. They had to replace the TDSU bearings, cush drive the TDSU gear and the one it meshes with and I got them to replace the detent mechanism and second gear and associated parts as recommended by warp 9.9

Cant wait to be on the road again, bit of a hefty bill at 2k but at least now I know it is sorted.
 

I am wondering the same thing. I have done 400 miles on my "new to me" R3T (6000 miles) and this is the only thing that really worries me. It is a rather large obvious slack. Can't determine if it is the shaft or transmission.
 
True, but IMHO the tranny is way way under geared (low). Considering the torque this monster makes, the 5th ratio should be something like 0.64.
 
I can tell you . . . they do not want you to know how improperly geared this motor is.
 
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