BMW K bikes (Bricks)

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1Back to top Go down    Which Battery on Thu Mar 31, 2016 4:13 pm

Johnny kidd

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Hi lads can anyone recomend a battery for my 91 k75, Im fairly sure the one in it is gone as bike refused to start after a ten mile run today.  Im fairly sure it is the battery as it was barely turning over the engine for the past couple of weeks. Cheers

    

2Back to top Go down    Re: Which Battery on Thu Mar 31, 2016 9:00 pm

RicK G

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For starters do you have ABS. I ask because I have seen faulty ABS destroy a battery because it was leaking current and causing the battery to go flat in about a week.
I have used the Motobatt MBTx30U from memory and it lasted 7 1/2 years and have had good reports from others. Not saying it's the only one as there are many others that are good. Oddessy 680 has a good reputation. Try to get an AGM type as they don't leak acid and will give good value because they last much longer than a lead/acid wet cell type.
The Ks came with either the larger 27AH which usually was fitted to the authorities bikes and LTs and the 18AH which was the usual battery fitted to the RS. Mostly the 75 was fitted with the smaller version.
I use the large size because I use a CPAP for sleeping and run it from the 12v when camping.
They all start quite well with the smaller so long as the CCA is around 250.
Now if that dont confuse you more will be along soon with their ideas Laughing


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Re: Which Battery on Thu Mar 31, 2016 9:48 pm

Holister

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+1 that. Just look for something around 20Ah will be all you need for a K75.
Maintenance free AGM or Gel battery is the best option as prices are very competitive these days.
Also, make sure you get the right physical size so it fits. Shouldn't be an issue with a 20Ah bat.
And the orientation of the terminals is important.

MBTX20U 
21 Ah
310 cca

There are cheaper AGM batteries. Look around for something with around the same specs.


__________________________________________________
1988 K100RT     VIN No.  0094680
1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
     Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

4Back to top Go down    Re: Which Battery on Thu Mar 31, 2016 10:09 pm

robmack

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Physical size and terminal orientation should also be considered.  OEM battery is L x W x H (mm): 186 x 130 x 171. Battery terminal type and orientation is as below (ignore the dimensions in the blue box):


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

5Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 7:44 am

Johnny kidd

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Thanks lads loads of useful info there. Laughing 
I took old battery out today and Im doubting it is the correct type for my bike to begin with, there was always a hesitation when starting as if the battery was struggling, heres a pic of what was powering my bike.



    

6Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 7:54 am

RicK G

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Woefully underpowered  That is an 11AH battery, the size used in small twins like 250cc max


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

7Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 8:28 am

indian036

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Also CCA (Cold Cranking Amps) at 120 is way way too low for a K. Probably the main reason for the starting issues. Potentially could also lead to starter relay contacts welding together. 

Bill


__________________________________________________
1985 K100RT Red.  VIN 0028991K100RT    ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT    ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT  ENG 104EA32848523
    

8Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 9:44 am

Johnny kidd

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indian036 wrote:Also CCA (Cold Cranking Amps) at 120 is way way too low for a K. Probably the main reason for the starting issues. Potentially could also lead to starter relay contacts welding together. 

Bill
Cheers Bill whatkind of CCA should I be looking for in my new battery? Mylocal dealer says he has a battery rated at 22AH for a very good price, would this be powerful enough provided CCA as you say is high enough

    

9Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 11:51 am

92KK 84WW Olaf

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When my K1100LT battery failed up in Westport on a Friday of a bank holiday weekend I was devastated.

A visit to a lawnmower shop produced an identical dimension battery for €50 which served me perfectly. Was 21Ah as far as I recall. Its still going.

KH has you covered there.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 87,100 miles
1997 K1100LT 58,000 miles
    

10Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 5:40 pm

indian036

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Johnny kidd wrote:
indian036 wrote:Also CCA (Cold Cranking Amps) at 120 is way way too low for a K. Probably the main reason for the starting issues. Potentially could also lead to starter relay contacts welding together. 

Bill
Cheers Bill whatkind of CCA should I be looking for in my new battery? Mylocal dealer says he has a battery rated at 22AH for a very good price, would this be powerful enough provided CCA as you say is high enough
I'm away from home and resources, but I think I'd be looking at a minimum of ~250CCA. Most of the recommended batteries are over 300,including the one KH recommended. 

Bill


__________________________________________________
1985 K100RT Red.  VIN 0028991K100RT    ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT    ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT  ENG 104EA32848523
    

11Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 6:02 pm

smithy

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I find the SSB XR series RB30CL-B very good, with 30 Ah and 460 CCA


__________________________________________________
87 K100rs : Vin 9462 
86 K100rt : Vin 9901
Naked
98 K1100lt: Vin 8044
    

12Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 9:20 pm

Johnny kidd

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RicK G wrote:For starters do you have ABS. I ask because I have seen faulty ABS destroy a battery because it was leaking current and causing the battery to go flat in about a week.
I have used the Motobatt MBTx30U from memory and it lasted 7 1/2 years and have had good reports from others. Not saying it's the only one as there are many others that are good. Oddessy 680 has a good reputation. Try to get an AGM type as they don't leak acid and will give good value because they last much longer than a lead/acid wet cell type.
The Ks came with either the larger 27AH which usually was fitted to the authorities bikes and LTs and the 18AH which was the usual battery fitted to the RS. Mostly the 75 was fitted with the smaller version.
I use the large size because I use a CPAP for sleeping and run it from the 12v when camping.
They all start quite well with the smaller so long as the CCA is around 250.
Now if that dont confuse you more will be along soon with their ideas Laughing
I don't have ABS Rick

    

13Back to top Go down    Re: Which Battery on Sat Apr 02, 2016 9:21 pm

Johnny kidd

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indian036 wrote:
Johnny kidd wrote:
indian036 wrote:Also CCA (Cold Cranking Amps) at 120 is way way too low for a K. Probably the main reason for the starting issues. Potentially could also lead to starter relay contacts welding together. 

Bill
Cheers Bill whatkind of CCA should I be looking for in my new battery? Mylocal dealer says he has a battery rated at 22AH for a very good price, would this be powerful enough provided CCA as you say is high enough
I'm away from home and resources, but I think I'd be looking at a minimum of ~250CCA. Most of the recommended batteries are over 300,including the one KH recommended. 

Bill

Cheers Bill

    

14Back to top Go down    Re: Which Battery on Sun Apr 03, 2016 8:30 am

Johnny kidd

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92KK 84WW Olaf wrote:When my K1100LT battery failed up in Westport on a Friday of a bank holiday weekend I was devastated.

A visit to a lawnmower shop produced an identical dimension battery for €50 which served me perfectly. Was 21Ah as far as I recall. Its still going.

KH has you covered there.
Sound Olaf thats good to hear, from the replies I have gotten so far Im assuming AH is the key as what was powering the bike was woefully inadequate like my front tyre ! I Have a good front tyre just need to fit it.  Cheers for replies lads its a work in progress Surprised--o:

    

15Back to top Go down    Enough Power? on Wed Apr 20, 2016 1:46 am

GF Wollongong

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I'd be wary of your starter motor if that 11Ah battery has been used a lot.

I stuffed a starter motor on my car (Nissan Pintara 450,000 kms and still going strong when sold) because the battery was dying. Starting the car was a fingers crossed episode. When on trip to country Victoria the starter motor went. The auto electrician said that failing to supply enough power to the starter motor can burn them out (brushes I guess - it was a very blackened item when removed at the side of the road).

Hopefully all is well with yours ... but just in case.

My battery is a Motobatt 21amp $160 MB51814. Has two years warranty. However, I either have an underperforming alternator or a leak somewhere. I have had to recharge it a few times. they are on ebay for around $140 plus.


Make sure if you use a C-Tek trickle charger to use the car setting (read the manual for 14.4 Ah or higher). Otherwise you are not charging the battery properly. 
And don't leave it in the back seat of the car with the dog - mine is kaput at the moment.


Regards


GF

    

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