BMW K bikes (Bricks)


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1Back to top Go down   50 amp Alternator Empty 50 amp Alternator Wed Oct 25, 2023 12:08 am

jjefferies

jjefferies
Life time member
Life time member
Hi all, I am looking into getting the larger alternator, i.e. 50 amp. My K75 is a '90 with a 33amp alternator. Well actually think I may have several extras of those around. But are there any negatives to upgrading? And which part number or bike should one come off. I figure to get it used.

    

2Back to top Go down   50 amp Alternator Empty Re: 50 amp Alternator Wed Oct 25, 2023 8:46 am

Dai

Dai
Life time member
Life time member
K1100LT and K1100RT police spec. You can spot them on ebay as the fan that is exposed on the 33amp version is now internal but monkey nuts cup is still there. Beware of any without the cup on as the K1200 60amp alternator visibly looks the same but it's a few mm wider and won't fit. The 50amp alternator is a drop fit but you will need to make one change: the 50amp alternator power feed is via an 8mm stud (8mm id ring terminal) and the control (blue) wire is fitted with a 6.3mm (1/4" inch) female terminal. The regulator is the same. Here you go:

https://www.ebay.com/itm/204258874150
https://www.ebay.com/itm/363766264792
https://www.ebay.com/itm/174401391464

The last two deserve a quick click at that price. You'll need to supply your own drive cup for the middle one.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

3Back to top Go down   50 amp Alternator Empty Re: 50 amp Alternator Wed Oct 25, 2023 9:10 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I have a 50 amp alternator that has been taking up space on my work bench.  You can have it for the cost of shipping. 

I don't know what model bike it came off of, but it has the 306 020 part number that says it's for a K75RT.

If you are interested PM me with your address and I will get a number for the shipping via the Postal Service.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

4Back to top Go down   50 amp Alternator Empty Re: 50 amp Alternator Wed Oct 25, 2023 11:54 am

duck

duck
Life time member
Life time member
Won't hurt anything but might not really be necessary these days. Many people went with the 50A in order to run a pair of 55W aux lights. LED aux lights generally need half of that or less. You can also run an LED headlight which also sucks about half as many watts as a halogen H4.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

5Back to top Go down   50 amp Alternator Empty Re: 50 amp Alternator Wed Oct 25, 2023 12:46 pm

Tranberg

Tranberg
active member
active member
Amps are still nice for heated gear, for the parts of your body that don't get heated by the engine

    

6Back to top Go down   50 amp Alternator Empty Re: 50 amp Alternator Wed Oct 25, 2023 1:05 pm

duck

duck
Life time member
Life time member
Tranberg wrote:Amps are still nice for heated gear, for the parts of your body that don't get heated by the engine

+10. I used to think that a heated vest was good (they are) until I got a jacket liner that does the arms too.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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