K 1200S Transmission Time

[Steverino]

Fresh off the successful rebuild of my 950 motor I figured it was time to fix the K1200S transmission skipping issue. So right now my options are as follows:

1. Take to dealer and pay $3500 for the transmission and probably another $1000 in labor and misc. parts.
2. Find a used transmission and redo it myself. Transmission must be black and end in 794 (later build and not prone to the problem)
3. Pull the current transmission and try to get the gears undercut to prevent the skipping. This will require replacing the forks if available.

Anybody given this a go before?

BTW it is a 2006 K12S with 35,000 miles. Same thing happened to my K1200R of the same year, but that was covered under warranty. I am unlikely to get any help from BMW.

[skwidd]

Full coverage insurance?

[Steverino]

Yeah...not an option.

[Steverino]

Step one: print removal instructions.

Step two: Research gear undercutting and send email. Asked if they undercut BMW gears...waiting for response.

Step three: Remove transmission.

Off to the garage.

[Steverino]

Found a shop that will undercut the K12s gears...

http://www.rcsperformanceonline.com/...ssion_s/54.htm

Time to get serious about pulling the transmission.

[bobw]

Try BMW for a good will. Known issue, failure at less than 36K, a mileage they would have covered if less years, good faith to loyal customer of many BMW's etc., etc., etc. Doesn't cost to ask and they are the ones saying they are commited to the QC changes needed due to several problems that they stated peaked in 08.

Good luck!

Cheers

[skibootdog]

go to small claims court.

[Steverino]

I expect nothing from BMW.

[Bueller]

Educate me:

cassette style, or do you have to split the cases?

Why would undercutting the engagement dogs require fork replacement?

[Steverino]

Yes it is a cassette and no need to split the cases.

What I have read is that the slipping of the gears will slightly bend the forks and make the tranny prone to repeated failures. The forks are available from BMW, none of the gears are though.

Should be able to remove in a couple of hours.

[Bueller]

Originally Posted by Steverino

Yes it is a cassette and no need to split the cases.

What I have read is that the slipping of the gears will slightly bend the forks and make the tranny prone to repeated failures. The forks are available from BMW, none of the gears are though.

Should be able to remove in a couple of hours.

No gears available? What a crock of shit.

Yes, a bent fork can occur that way. Or, a ham-fisted (ham-legged?) operator can bend a fork by forcing the shifter, which will cause the gear to not fully engage and start jumping out. Definitely a chicken/egg scenario, but I'm not suggesting that is the case here.

Being a cassette style it should be pretty easy. As I'm sure you already know, there just isn't that much to a manual geartrain.

[Steverino]

Yeah who knows the real cause, all I know is BMW could have prevented it by undercutting the gears during manufacturing. They straight cut them until late in 08 I think.

The guy I emailed in NC says he can fix it...we will see.

Maybe a futile effort with BMW is worth a trip... All they can say is no.

[Jetpilot5]

Watching this thread with interest. My 06 K12S hasn't had any transmission issues in the 49,000 miles I've put on it since new but you never know.

[Steverino]

Well I basically got laughed at when I discussed any chance of help with a warranty for this. Thanks BMW...

So now it is back to my options. The more research I did the more I realized how expensive this was going to be. Shift forks would cost over $600 and if the gears were damaged could not be undercut. So I am looking pretty much screwed. Debated parting it out and just walking away.

Then I found a K1200S transmission on ebay. Should be shipping my way Monday. Since it is undamaged and functional I am still going to send to the Machine shop to see if it can be undercut.

Still going to be an expensive repair, but a transmission for 1/3 the cost of one from BMW is a good start.

[Uncle Pollo]

Originally Posted by Steverino

Fresh off the successful rebuild of my 950 motor I figured it was time to fix the K1200S transmission skipping issue. So right now my options are as follows:

1. Take to dealer and pay $3500 for the transmission and probably another $1000 in labor and misc. parts.
2. Find a used transmission and redo it myself. Transmission must be black and end in 794 (later build and not prone to the problem)
3. Pull the current transmission and try to get the gears undercut to prevent the skipping. This will require replacing the forks if available.

Anybody given this a go before?

BTW it is a 2006 K12S with 35,000 miles. Same thing happened to my K1200R of the same year, but that was covered under warranty. I am unlikely to get any help from BMW.

K1300S tranny will fit.

And it will be BETTER.

DAMHIK