BMW K bikes (Bricks)

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1Back to top Go down   86 K100 RS Cracked Ignition Coil Empty 86 K100 RS Cracked Ignition Coil on Wed Dec 19, 2018 4:28 pm

highflyer

highflyer
active member
active member
Hi all, on removing the ignition coils on my 86 K100 RS project build, I noticed that one is cracked - presumably this coil will need replacing? They seem to be quite expensive, so was wondering if they can be repaired? The affected coil is the forward coil for cylinders 1 & 4. The other coil seems to be fine. Thanks in advance for your feedback86 K100 RS Cracked Ignition Coil 112350

86 K100 RS Cracked Ignition Coil Img_3610

86 K100 RS Cracked Ignition Coil Img_3210

86 K100 RS Cracked Ignition Coil Img_6110

    

2Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Wed Dec 19, 2018 4:44 pm

Dai

Dai
Life time member
Life time member
I'd say that's been dropped. As you're in GB and subject to the same amount of skyp!ss that I am, I'd replace it. The chances are that the sealant around the internal windings is also damaged and once water gets in there (as it will), you'll be stranded in the most inconvenient place possible. Check ebay; if you're in no hurry coils do come up relatively cheaply. I got a pair for 30 after I'd dropped one and smashed the HT terminal off it.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

3Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Wed Dec 19, 2018 4:54 pm

duck

duck
Life time member
Life time member
It may have just cracked from age. It's 30 year old plastic that's been exposed to heat and vibration.


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Wed Dec 19, 2018 8:28 pm

RicK G

RicK G
VIP
VIP
That is similar to age related cracks I have seen over the years with those black coils.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

5Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Wed Dec 19, 2018 11:04 pm

Waz

Waz
Life time member
Life time member
I went through a few second hand ones before getting some new red tops. A mechanic told me you can repair them with nail polish.


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1987 K100 RS
1997 R1100R
1996 R1100GS
    

6Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Thu Dec 20, 2018 7:36 pm

yamaguzzi

yamaguzzi
Silver member
Silver member
There is a marine product called "Glove It " that is a slow drying penetrating epoxy that would probably seal that up nicely . Gloveit Epoxy If the coil is still in good working order this would fix that crack and seal it up tight.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

7Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Thu Dec 20, 2018 11:53 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I would suggest sealing the crack with whatever you like and beginning a search for a set of the later version. In the years I've been hanging around here I've seen a fair number of those early coils have problems and require replacement. Personally, I wouldn't trust them anymore.


__________________________________________________
Present:
1994 K75RT
1991 K100RS

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

8Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Fri Dec 21, 2018 4:51 pm

yamaguzzi

yamaguzzi
Silver member
Silver member
@Point-Seven-five wrote:I would suggest sealing the crack with whatever you like and beginning a search for a set of the later version. In the years I've been hanging around here I've seen a fair number of those early coils have problems and require replacement. Personally, I wouldn't trust them anymore.
When did the later version come into production ?


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

9Back to top Go down   86 K100 RS Cracked Ignition Coil Empty Re: 86 K100 RS Cracked Ignition Coil on Fri Dec 21, 2018 7:11 pm

duck

duck
Life time member
Life time member
I had thought it was earlier but the parts catalog indicates 9/88.

86 K100 RS Cracked Ignition Coil 141gx10


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

10Back to top Go down   86 K100 RS Cracked Ignition Coil Empty K100 Coils on Sat Dec 22, 2018 5:02 pm

redrockmania

redrockmania
Silver member
Silver member
In response to Yamaguzzi's Post 8
The coils for the 8 valve early K100's are part #: 12131459513. Yes, the original factory installed black only coils are more prone to failure than the later coils with the red towers for the plug leads. If buying from a non-dealer be careful if buying the later "red tower" coils that you are buying the correct type. The visual identifier is that the 8 valve coils have 2 male spade post connectors to attach wiring.
The coils for the later 16 Valve motors also have "red towers" for the 2 plug leads BUT the wiring connector is a rectangular shroud with rounded edges and there are two round pins inside the shroud to attach the wiring. The BMW Part # for these coils is different.
Be careful to make sure you are looking at the correct coil for your machine before buying. On a number of occasions I have seen them incorrectly identified.
The excellent guide on our Forum for coil testing is easy to follow.
I

    

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