K1200 / K1300 gearbox compatability - K-Bikes.com - Excellence in Motion
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post #1 of 7 (permalink) Old Sep 27th, 2014, 9:13 am Thread Starter
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K1200 / K1300 gearbox compatability

Can anyone confirm whether the cassette gearbox from a K1300S is a straight swap for a 2006 K1200S gearbox?
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post #2 of 7 (permalink) Old Feb 20th, 2015, 5:45 pm
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It is. I have a k1200s from 2005 running a K1300s gearbox.
...and it works a treat
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post #3 of 7 (permalink) Old Aug 8th, 2018, 8:31 pm
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I’d like to make the same swap, but I’d read that BMW said you needed to also swap the K12S clutch for a K13S clutch to make it work. Not true?
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post #4 of 7 (permalink) Old Oct 18th, 2018, 11:03 am
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Quote:
Originally Posted by Dobervol View Post
Id like to make the same swap, but Id read that BMW said you needed to also swap the K12S clutch for a K13S clutch to make it work. Not true?
Since I now know the answer, I am re-posting to help anyone else with the same question.

I bought a used trans from a K13GT. It has the larger holes drilled in the shaft to bathe the clutch in oil (the 12S clutches were notoriously under-oiled), so when looking for salvage, look for a K13 trans, NOT an old K12 trans, because you'll just be buying the same problem set (an underoiled "wet" clutch which imitates a dry one, and transmission dogs which are NOT undercut, resulting in common failures of 2d, and sometimes 3rd, gear). The K13 iteration fixed both those issues.

However, when you buy a salvage (or new, but why would you buy new for a bike this old?) trans, it will come without the little spinning collar which sits over the shaft and also has two holes drilled into it and throws out oil to wet the clutch. Unless you also buy that part from a K13 (and if you do, it WILL fit a K12), you will need to drill out (and emery to baby's butt smooth) the two, smaller holes on your K12 clutch shaft collar to the same diameter as the holes in the K13 transmission shaft. I found this out before doing the work from a BMW mechanic of 40 years, and the advice was spot-on.
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post #5 of 7 (permalink) Old Feb 8th, 2019, 2:13 pm
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Hi, I am planning to swap my k1200s gearbox for a K1300S gearbox. Do you have a picture of that little spinning collar which sits over the shaft or a part number.

Cheers
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post #6 of 7 (permalink) Old May 23rd, 2019, 5:20 pm
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I am about to replace transmission K1200R 2006 with a used K1300. I’m looking for documentation, videos, and or pictures for this project. Please advise.
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post #7 of 7 (permalink) Old May 25th, 2019, 2:27 pm
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Oil pump drive behind the clutch is different also.
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