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Gear change problems
http://www.ukbeg.com/forum/viewtopic.php?f=8&t=22530
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Author:  Spoonbill [ Wed Jul 26, 2017 8:23 pm ]
Post subject:  Gear change problems

Hi Guys

My 43k '04 XB9S Has developed a gear change problem. The change between second and third starts ok when cold, and gets progressively worse as things warm up until it won't shift at all. I've adjusted the clutch and the primary chain, and changed the oil (both), without improving things. I'm a bit concerned that if someone tries to repair it by replacing worn components there won't be any bike left!

Any ideas? Thanks

Author:  pash [ Wed Jul 26, 2017 9:25 pm ]
Post subject:  Re: Gear change problems

Is the gearbox output shaft bearing worn out? Can you move the front pulley up and down?

Author:  Maz [ Wed Jul 26, 2017 9:36 pm ]
Post subject:  Re: Gear change problems

:yt:....and even if you cant, remove the blanking plug and inspect the mainshaft needle race :idea:
Also, very common failure is the clutch basket needle race.

Author:  Spoonbill [ Wed Jul 26, 2017 10:15 pm ]
Post subject:  Re: Gear change problems

Thanks Guys, gives me somewhere to start.

Author:  Nutah [ Thu Jul 27, 2017 5:18 pm ]
Post subject:  Re: Gear change problems

just a thought ,is the clutch ? & primary chain ? , adjusted correctly too

Author:  Finmows [ Fri Jul 28, 2017 11:42 am ]
Post subject:  Re: Gear change problems

Spoonbill wrote:
I've adjusted the clutch and the primary chain

Nutah wrote:
just a thought ,is the clutch ? & primary chain ? , adjusted correctly too

It's always best to check twice ;)

Author:  Nutah [ Sat Jul 29, 2017 8:35 pm ]
Post subject:  Re: Gear change problems

:coat:
:rotfl: :rotfl:

Author:  Spoonbill [ Tue Aug 01, 2017 7:29 pm ]
Post subject:  Re: Gear change problems

OK, I can feel some movement at the pulley, but it's too small to measure, or even see. Not more than 0.5 mm. Is anything more than 0 a fail?

Author:  Maz [ Tue Aug 01, 2017 7:43 pm ]
Post subject:  Re: Gear change problems

Did you remove the blanking plug to check the mainshaft needle race ?

Author:  Spoonbill [ Tue Aug 01, 2017 10:12 pm ]
Post subject:  Re: Gear change problems

Not yet, I had a quick look through the manual and It's not obvious what to do. Chance of some instructions for idiots?

Author:  Maz [ Tue Aug 01, 2017 10:50 pm ]
Post subject:  Re: Gear change problems

In the centre of the front drive pulley there's a 'rubber' seal/blanking plug......stick a screwdriver through it and lever it out.
Behind you will see the end of the mainshaft supported by a needle bearing......this should be clean and wet with oil, no corrosion, bluing etc.

Author:  Spoonbill [ Mon Aug 07, 2017 8:28 pm ]
Post subject:  Re: Gear change problems

OK, thanks. Couldn't see for looking.
Mainshaft looks fine.
Experimenting on the road I find I can change gear if I make it as quick as possible. I normally change gear quite deliberately on the Buell, but if I do that it won't change at all. Synchro problem maybe? Problem is definitely restricted to the 2nd to 3rd change only.

Author:  Spoonbill [ Sun Aug 13, 2017 9:49 am ]
Post subject:  Re: Gear change problems

Further experiments mean I've now got a totally inconsistent problem. Sometimes I can't get neutral and stepping on the leaver feels like stepping on a bag of spanners, sometimes I can't make a gear change, mainly between 3rd and 4th now. Can anyone think of one possible cause, or is this likely to be just wear?

Author:  Dunno [ Sun Aug 13, 2017 5:08 pm ]
Post subject:  Re: Gear change problems

In the dim and distant past of when my M2 was new, it had symptoms like that which were fixed under warranty. If memory serves I think the stealership said the problem was that the detent plate in the gearbox was loose or out of alignment, which I guess would cause the selector barrel to move to positions that don't correspond to a proper gear selection. :?

Maybe someone more knowledgeable can comment if that sounds plausible and if it could also apply to XB gearboxes :)

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