IHello!

I would like to change my 33A Generator to a 50A Generator.

Question: can I use a Generator from K 1100RS 1995 to fit my K 75 plug & play?

I know the the Generator from a K 1200 will fit if you drill bigger holes and take a 1-2mm from one side away.
And I know all German police/administration Ks have Generator with 50A but I could get one from a K1100 from 1995

I would like it plug & play :-)

Cheers and enjoy Xmas

I put one on my '85 K100.

I believe if you do a search there is info available on this...

All K75's have a 50A alternator as standard from 07/93 and on.

Almost plug and play.

First difference:  The wiring attachment to the two types differs.

Second difference:  They take two different couplers on the alternator shaft. The 33 amp unit has a shaft with a Woodruff key and the coupler is slotted for the key. The 50 amp unit has a shaft that is not slotted for the key. The coupler from a 33 amp unit is a loose fit on the shaft of a 50 amp unit and the coupler slips no matter how tight you try to tighten the nut. So - when swapping from a 33 amp to a 50 amp alternator in your early bike so equipped - get a new coupler for the 50 amp unit.  You need to order the correct driven Hub 12 31 2 305 329. The 50A Alternator does not use the fan wheel either. The Hub for the 50A is about twice as deep as the 33A model.

Careful to ensure the depth from the flange to the top of the coupler are exactly the same for both, otherwise you'll end up destroying the alternator drive bearing, requiring you to completely disassemble the bell housing to replace it.  DAMHIK.

Thanks all for your infos!

# Robert, you had your expiriance, I read your old thread!
I will learn from that :-) perfect tip!!!

Mary Christmas to all of you and your families
Cheers