What size bleed nipple for clutch k1300s?

its mineral oil.

you can use mineral oil from chemist. much much cheaper . and same thing. i would not bother to bleed it. if you do use a syringe and push the oil in .
 
I realize that my answer is overdue. But if you plan to bleed the clutch, you may order the bleed nipple from the BMW dealer.

Have a look at this partslist:
https://www.realoem.com/bmw/enUS/showparts?id=0508-EUR-08-2012-K40-BMW-K_1300_S_0508,0509_&diagId=21_0210

The bleed nipple is #8. You simply remove the grub screw and enter the bleednipple, and use it like any other. Mind you it has a lesser diameter than the brakes, so, a tube with less diameter is required if you want to avoid spillage. On the other hand, the clutch fluid is mineral, and I don't think it will cause damage to the paint.
If you intend to keep the bleed nipple in there on a permanent basis, order the dust-cap #9 as well
 


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