Clunk in the drive....somewhere.

[Sgt Bilco]

Just finished rebuilding my 1100 and it`s really superb!!! Runs great and will be getting St Eptoe to give it the once over.

Have a slight issue which maybe something or nothing. When I roll off the throttle in top gear, I can feel a dull clunk somewhere. Same happens when I open the throttle again and it`s as if it`s jumped a gear. It`s not immediate and is perhaps half a second after there bike has accelerated.

Any ideas anyone?

 

[Big Lad]

Read it and weep!. Good luck.


http://www.ukgser.com/forums/showthread.php?t=52784&highlight=gear+jumps

 

[Muppet]

Not sounding too promising Chris, and before you ask, I don't have my gearbox anymore. Long shot, if it turns out to be anything to do with the final drive, I have the complete unit sitting in my shed ready to be bolted on.

I'll see you tomorrow anyhow.

 

[Tsiklonaut]

Yep, sounds like a M94 gearbox (R1100-s from 1994-1996) issue.

Have M97 gearbox (R1100-s from 1997-1999) put on to it if possible. Or re-build the M94 to M97 spec if it's possible.

 

[Dragon Master]

Hi Sarge,

Guess what, you've just described the symptoms I've been having for some time now, about five years. I happens as you say, when accelerating from a relaxed throttle, most noticeable in fifth; the drive takes up with a jolt after about half a second. And yes, after preparing to do the 'wave washer' mod, I discover it's actually a '95 box.

Took it apart yesterday, and the taper roller bearing at the rear of the input shaft is shot, before I took it out there was about 1-1.5mm of end float, and Tapered rollers shouldn't have any as far as I know.

I'm now trying to decide whether to replace the roller bearings, convert it to ball bearings, or take the other box off the bike, (a '99) fix the oil seal, and do the wave washer conversion on that. I suppose it depends on the price of new roller bearings, and I have ordered two spacers to replace the wave washer. (Two gearboxes, I thought this one was a '97...)

I don't think the conversion would be too difficult, BMW used to do a 'repair' kit; scroll down to '94 input shaft on this:

http://www.xmission.com/~wendell/R1100GS/trans.html

The bearings are easy enough to get hold of, Motorworks do them, but there's no info about ther dimensions of thetwo washers shown behind the front bearing. Maybe St Eptoe could throw some light on this? 'Twould be much appreciated...

Good luck with yours...

Dave.

 

[Sgt Bilco]

Aaah, I hoped it wasn`t the box but it`s definately coming from there so I reckon it`s bad new`s!!

I have to get it fixed because I`m shipping it to the US in June to do the Trans America Trail and don`t want the gearbox to disntigrate in deepest darkest Arkansas although I guess a John Deere gearbox will do

A couple of questions:

Will in fail or will it carry on just clunking?
Tsiklonaut....how much for the M97 box

Thanks for your help guys.

 

[Dragon Master]

Will in fail or will it carry on just clunking?

See my reply above; mine's been doing it for about five years; I decided to do something last October when it started making 'groaning sounds as the clutch engaged...

Dave.

 

[Colban]

Aaah, I hoped it wasn`t the box but it`s definately coming from there so I reckon it`s bad new`s!!

I have to get it fixed because I`m shipping it to the US in June to do the Trans America Trail and don`t want the gearbox to disntigrate in deepest darkest Arkansas although I guess a John Deere gearbox will do

The US might be the best place for it to fail.
http://www.largiader.com/
This guy seems to be able to do a good job upgrading the boxes.
Bit of a bugger if all you want is to ride the US though and the bikes in bits.