K100RS parked for four months outside in all weathers

[Laitch]

From what I am reading it is possible that only the tranny from another K100 RS 16v will fit, not the K100 2v or the K1100 which would be a major pain.

That's not what I get from Frankenduck's post. The part numbers are different; that's certain. Don't jump the gun yet. Maybe somebody with more experience will chime in soon.

[Filmcamera]

So I reached out to Chris F bomb Harris and the man himself answered!


He said


Second gear needs to be undercut


This being chinese to me I did some research and found this video





That seems like the perfect explanation of what is happening to me and Motorhobo.


It also seems like something that I might be able to have done here with a little luck.

[Laitch]

Second gear needs to be undercut

Helpful research and presentation, Filmcamera. Thanks!

[Filmcamera]

In the end I have bitten the bullet and purchased a transmission. 


http://www.ebay.com/itm/401230552892


Chris Harris no less confirmed that a K1100RS tranny will fit my bike and there was one available on ebay in FL from a 1993  In shipping to my mail forwarding company it was $160.  Though heavy it is not hugely bulky so I can use there by sea service to get it here.  It will take a bit longer but that way I should be able to keep tax and shipping down to another $100.  So in the end $260 for a new tranny rather than trying to take mine apart and find someone to undercut second seemed to make sense. It also means the original one can possibly be used for spares in the future if needed.

[Laitch]

. . . on ebay in FL from a 1993 . . . 

Not just from FL but from the potato capital of FL. :2thumbup:

[Filmcamera]

Potato capital of Florida is a dubious claim to fame at best.


It is actually a mine of potential spares at what looks like good prices for any K1100 RS owners out there


http://stores.ebay.com/MotoplaneParts/BMW-/_i.html?LH_TitleDesc=1&_nkw=project%3A+1635&_fsub=2546164011&_sid=1038412291&_trksid=p4634.c0.m322


I am going to post the link seperately as well in case anyone is looking for parts

[The Mighty Gryphon]

Sounds like a wise choice.

I am going to guess that undercutting the dogs is a pretty touchy job with lots of set up time to get right.  The machining alone is going to cost almost as much as your "new" transmission and there is no guarantee that it will correct the problem.  Then there is the complete disassembly of your transmission to get the gear set out.  Lots of opportunity to create more trouble there.

$260 sounds pretty cheap, especially so if it includes the ability to add a couple good seal boots, a spare shift lever and a working gear position switch to your spares inventory.

[Filmcamera]

That was my thinking for sure, from the photos it even looks like it come with a driveshaft and a clutch arm which cant be bad.

[bocutter Ed]

It's also possible you have a bent shifter fork, or have dropped a roller from the end of a fork. I got a used tranny missing a roller. (T'was ok because I just needed the selector shaft.)

[Filmcamera]

No they will not, those tools are for 2V bikes, adjusting the valves on a 4V is a totally different thing - and honestly not something most of us mere humans can undertake - I know I would never try it anyway.


As to whether it is needed or not.  Well I think it is a good idea to check the valve clearances once in a while but Chris Harris disagrees.

[Filmcamera]

A Englishman, Frenchman and German were discussing the virtues of their various languages.

The Englishman says - English is the language of poetry, take for example the word 'butterfly' it captures the epitome of the creature, the gentle soul and magic of its loveliness.

The Frenchman says - Ah but French is the language of love, take for example 'papillion' it captures perfectly the romance and beauty of the creature.

The German says - zo vat iz vrong mit schmetterling?

[Filmcamera]

When I did mine I followed the torque instructions from the pdf I downloaded from here



10c K100RS4V, K1, K1100: Tighten the clutch nut to 140
Nm, loosen it and then retighten to 50 Nm.


That is 103 foot pounds first then loosen and tighten again to 37 ft lbs.


I have had no issues after doing it like that

[Filmcamera]

Wow time for me to tighten the clutch nut mire when I go in and replace my tranny in  couple of weeks when it finally arrives

[Filmcamera]

My replacement transmission finally turned up today!!  :clap: :clap:


It came with half a drive shaft, I have one U joint but not the other. My feeling is that I can use it in emergencies but generally it is not advisable to  mix and match a drive shaft with a U joint, right?


The various shafts and splines all look good to me but I would appreciate a second opinion.


My plan is to install it on Tuesday (my older son has his day off then and can help me).  More to follow


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[Elipten]

Splines look great


Sent from my iPhone using Tapatalk Pro

[Martin]

 :2thumbup: looks fine.

[The Mighty Gryphon]

Those wide flats at the top and the sharp edges on those flats are a thing of beauty.

[Filmcamera]

I spent the best part of today installing the new transmission.  So far everything has gone perfectly - except for one small issue which I find odd.


The bolts connecting the tranny to the frame are M8 on my bike.  When I installed the new one it seems the LHS is M8 but the RHS is M6?? Is this even possible?


The tranny is from a 1993 K110 so maybe, but different size bolts on the left and right sides? Seems very unlikely.   I am not sure whether to just go with M6 or to tap out the hole and make it M8 - I am slightly worried that the frame is meant to have a M8 so a M6 might cause issues of some type.


I also retorqued the clutch bolt to the correct torque and used my new clutch centering tool - wow does that make things easy!  I also managed to get the entire rear brake system including ABS modulator off in one piece so no rebleeding needed.  :clap:


If all goes well I should be able to do a test ride tomorrow.


Any input on the tranny to frame bolts sizes would be great, thanks.

[Laitch]

This might be caused by guaro excesivo. Sleep on it.

[Filmcamera]

hmm maybe but I discovered that issue at 3 pm before any guaro had been imbibed - maybe guaro deprivation is the issue?  I tried a M6 on that side and it threads in perfectly, on the other side I can just pull it out.  I am thinking maybe a bad previous repair? Anyway I am concerned enough that I plan to pull the tranny back out tomorrow so I can have a closer look and see what is going on.

[The Mighty Gryphon]

Filmcamera, can you post a photo of the bolts in question?

On my K100RS they are M10, and the K1100 also uses M10.  An M6 is even small for attaching the transmission to the intermediate section.  Those are all M8.

[The Dude]

Filmcamera, can you post a photo of the bolts in question?

Seeing is believing.
Pass over the guaro.

[Filmcamera]

Well it was a M8 helicoil in the M10 hole - kept in the JB weld (I think) of all things.


Anyway I drilled it out, put in a M10 helicoil and reused the correct sized original bol. Now the new tranny is installed and the bike is all back together and good to go.


I was about to go for a test ride when the heavens opened so I will try a quick ride tomorrow morning.


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[Laitch]

Well it was a M8 helicoil in the M10 hole - kept in the JB weld (I think) of all things.

That must have been the result of milk punch and tobacco. Probably happened the same day they installed the front wheel flipped.
Your determination is inspiring.  :2thumbup:

[The Mighty Gryphon]

 :clap: