'92 K75S abs USA alternator upgrade - K-Bikes.com - Excellence in Motion
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post #1 of 3 (permalink) Old Oct 30th, 2012, 1:17 pm Thread Starter
Join Date: Oct 2012
Location: Philadelphia, PA, USA
Posts: 2
'92 K75S abs USA alternator upgrade

I am trying to upgrade from a 32amp. to 50-60 amp. alternator so I can run extra lights heated clothing GPS etc. all at the same time. Accessories and stock lights add up to 26 amp. draw. I've heard you should use 80 percent, or in my case 26,4, the balance left for recharging. I'm at 26 amps. without counting engine needs. So far have purchased two differnet remanufactured Bosch alternators that vendor claims are used for the upgrade. Neither fit (bolt pattern is off). Can I get the origanal stator rewound to increase amps. or is their another solution. I've heard that this upgrade has been done before and in fact BMW went to a 50 amp. alternator in mid '93. A new one costs $900 and there is no guarantee it will fit as it has the same part number as my 2 remanufactured ones. Any inights will be greatly appreciated.
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post #2 of 3 (permalink) Old Oct 31st, 2012, 12:03 am
Join Date: Dec 2010
Location: Lebanon, OR, USA
Posts: 41

Frankenduck has a whole website on upgrades for K bikes, he is like a genius on K bikes, but don't tell him... Check out his website for Alt swap


2008 FLHT
2008 R1200RT
1985 K100 RT
1979 XS 650 Street tracker
Ridden everything,owned lots
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post #3 of 3 (permalink) Old Oct 31st, 2012, 3:52 pm Thread Starter
Join Date: Oct 2012
Location: Philadelphia, PA, USA
Posts: 2
Problem solved

We "reclocked" alternator #2. It barely fits, but it works. If anyone is planning to upgrade their charging system from 32 amp. to 60 amp. on early K Bikes, call John Rayski, 303-526-0901, at Euro Motoelectrics (www.euromotoelectrics.com), he has the upgrade. Remanufactured Bosch alternator is $250.00 with trade-in core. A new one from BMW is $900.00.
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