www.boxertrix.com

Having recently bought my lovely 1100S, I then promptly buggered off to the USA on an unexpected work trip for 9 days. Got back on Friday, so took every available opportunity to get some riding in over the weekend. Yesterday in particular was great - had a good three hours hooning around and generally scuffing up the rear tyre!

However, one thing I've noticed is an occasional clunk when pulling away in first. Doesn't do it if I'm really careful. It's as though the transmission is taking up some slack, and everything kind of clonks in to place as you pull away.

Any ideas? Hoping it's normal!

Thanks,

Nik

Is it just as you fully release the clutch? My GS and my S both do it so I think it's pretty normal.

there's a lot of pig iron stirring around in boxer gearboxes, Brunel would have been proud

Face cam power transmission shock absorber? Just doing its thang. Not suggesting it's faulty.

Do they knock? They look like they might!

metropolis2k wrote:Is it just as you fully release the clutch? My GS and my S both do it so I think it's pretty normal.

Good news, that's reasuring! It doesn't do it all the time, especially if I'm super-careful.

Nik

Corvus wrote:Face cam shock power transmission absorber? Just doing its thang. Not suggesting it's faulty.

Do they knock? They look like they might!

Is a Face cam shock power transmission absorber an actual thing?! Sounds like a name for something that's been translated from German using Google Translate!

cheers,

Nik

Motocod wrote:Good news, that's reasuring! It doesn't do it all the time, especially if I'm super-careful.

Nik

Sometimes it's more noticeable than at other times with my bikes. Where are you in the South East? If we ever cross paths I'd happily swing by and let you compare it to another bike to put your mind at ease. I'm in London usually but often down near Farnham where the parents live.

Motocod wrote:

Corvus wrote:Face cam shock power transmission absorber? Just doing its thang. Not suggesting it's faulty.

Do they knock? They look like they might!

Is a Face cam shock power transmission absorber an actual thing?! Sounds like a name for something that's been translated from German using Google Translate!

cheers,

Nik

Dunno, but I had the right words but just in the wrong order! I meant face cam power transmission shock absorber. Every self respecting shaft driven bike should have one.

Oh, and BSA A10's.

No knocking/clunk for me, I'd panic that the drive splines were wearing if I heard that, but if others have the same without any drive failure, then I will rest easy

Mine has been clunking for nearly 10 years...

metropolis2k wrote:

Motocod wrote:Good news, that's reasuring! It doesn't do it all the time, especially if I'm super-careful.

Nik

Sometimes it's more noticeable than at other times with my bikes. Where are you in the South East? If we ever cross paths I'd happily swing by and let you compare it to another bike to put your mind at ease. I'm in London usually but often down near Farnham where the parents live.

Regrettably I live off-shore (Isle of Wight), so not that ideal for meeting up!

Thanks though!

Nik

related subject: Drive Shaft....I have'nt seen anywhere in BMW forums about having universal joints at 90 degrees to each other, to minimise the variations in velocity that occurs in UJ's (front drive cars use constant velocity joints for that reason). As a newbie to R1100S my questions are:
1. can the splines be assembled in various positions.
2. can the forward UJ be seen when assembling the rear one.
3. has anyone noticed any effect after reassembly.

ODDWHEELS wrote:..................about having universal joints at 90 degrees to each other, to minimise the variations in velocity that occurs in UJ's
1. can the splines be assembled in various positions.

The shaft should be assembled 'in phase' so that the variations in velocity of the second joint theoretically cancel out those at the front joint.

see here:

http://en.wikipedia.org/wiki/Universal_joint

Doesn't apply to the R1200 range because their driveshafts are bonded!

sandbar

Thanks Sandbar, you indicate that the splines can be assembled and not have the UJ's at 90 degrees, I wonder how many BM's are being ridden like that?