K11 Owners Group

CR_Bricker · Brick Rider Joined: 06 Nov 2016 Posts: 25

Hi

Today I took my 1991 K100 RS 16V on a spirited ride through some twisties. About an hour in something happened to second gear when I was pushing hard at about 8000 revs. It felt like I had briefly pulled and dumped the clutch. First and third remained fine. Later I had the same slipping issue in second again under gentle acceleration at maybe 3000 revs.

A member of motobrick just had a very similar issue and ended up swapping his tranny out. Does any one know if a k1100 RS tranny fits my bike? I found one from a 1993 bike for $120 on ebay.

I would appreciate any advice,

Thanks
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1991 K100RS with K1100 RS fairing
Costa Rica

Jim · Posted: Sat Apr 22, 2017 3:19 pm Post subject:

Doesn't look like it will fit. The K11 tranny fits K11s and K1.

http://www.maxbmwmotorcycles.com/fiche/PartsSearch.aspx?&searchtype=partnumber&parts=23%2000%201%20464%20470

The K100 tranny fits K100

http://www.maxbmwmotorcycles.com/fiche/PartsSearch.aspx?&searchtype=partnumber&parts=23%2000%201%20464%20143

Good luck finding a transmission.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

CR_Bricker · Brick Rider Joined: 06 Nov 2016 Posts: 25

Hi

Thanks for that. It is a bit confusing because my K100 is a 16v and so a paralever whereas most are 2v and monolever. It appears to be a matter of if the tangs to mount the paralever are on the tranny or not.

I found three different trannys on ebay and as far as I can see only the k1100 RS one has said tangs.
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1991 K100RS with K1100 RS fairing
Costa Rica

CR_Bricker · Brick Rider Joined: 06 Nov 2016 Posts: 25

The other question is if the guts are the same, in which case I could keep my housing and just swap the bits inside from the new one into mine.
_________________
1991 K100RS with K1100 RS fairing
Costa Rica

Jim · Posted: Sat Apr 22, 2017 3:29 pm Post subject:

I guess you could check the fiche to see if the inner workings are interchangeable.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Jim · Posted: Sat Apr 22, 2017 3:41 pm Post subject:

You might find some more helpful information here:

http://largiader.com/articles/gearing/
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

CR_Bricker · Brick Rider Joined: 06 Nov 2016 Posts: 25

Ok it turns out that what I need is second gear undercut. That means that the dogs have become worn and end up pushing 2nd gear apart under load. The solution is to cut them back with a lathe tso they interlock nicely again.

I am hoping this is something I can get done here so I am going to look for a good metal shop and see if my spanish is up to explaining the problem!
_________________
1991 K100RS with K1100 RS fairing
Costa Rica