BMW K bikes (Bricks)

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1Back to top Go down   K75 Ignition Cables / leads Empty K75 Ignition Cables / leads Wed Feb 17, 2021 9:45 pm

roach374

roach374
Silver member
Silver member
So there are a lot of very old posts on the forums about K-bike ignition cables, and how they are "special" (built in resistors, and gap resistance in the coil ends of K75 leads in particular? I think?)

I'm in the process of relocating the coils on my '93 K75, and need longer / custom leads. It sounds like I can't just pick up whatever random ignition cable kit off Amazon, but need something a bit more "specialized"?

Can anyone recommend a decent kit for build-your-own cables for the K75? All the old forum posts mention Realm, RAM, and a couple others, but a lot of them are dead links, discontinued, or no longer in business.

Thanks in advance for any help!

    

2Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 1:14 am

Laitch

Laitch
Life time member
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This place sells Brick customization trinkets.


__________________________________________________
1995 K75 81,000 miles
K75 Ignition Cables / leads Usa-lo10
    

3Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 2:11 am

MartinW

MartinW
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__________________________________________________
K75s Hybrid
    

4Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 4:25 am

Dai

Dai
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@Laitch wrote:This place sells Brick customization trinkets.
Not at that price, Laitch. Can get the same setup here (plug caps plus leads) for €35 or less. Complete ripoff for the gullible.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

5Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 12:12 pm

roach374

roach374
Silver member
Silver member
@Dai wrote:
@Laitch wrote:This place sells Brick customization trinkets.
Not at that price, Laitch. Can get the same setup here (plug caps plus leads) for €35 or less. Complete ripoff for the gullible.

Got a link or anything? cafe4racer is great for *some* things, but their ignition wires are pre-cut (not the right length for me), and they don't have the coil-side end caps (which I'm led to understand are special somehow?)

    

6Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 12:52 pm

Laitch

Laitch
Life time member
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@roach374 wrote:
Got a link or anything? cafe4racer is great for *some* things, but their ignition wires are pre-cut (not the right length for me)
What's the right length for you? Resistor caps are available from several sources. Please click on your Profile tab then click on the Signature tab within it and put your moto's year of manufacture, model and body style—RT, S, Standard—so they will show up in every post you make and respondents will know what you've got without needing to track down the details.


__________________________________________________
1995 K75 81,000 miles
K75 Ignition Cables / leads Usa-lo10
    

7Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 2:12 pm

roach374

roach374
Silver member
Silver member
@Laitch wrote:
@roach374 wrote:
Got a link or anything? cafe4racer is great for *some* things, but their ignition wires are pre-cut (not the right length for me)
What's the right length for you? Resistor caps are available from several sources. Please click on your Profile tab then click on the Signature tab within it and put your moto's year of manufacture, model and body style—RT, S, Standard—so they will show up in every post you make and respondents will know what you've got without needing to track down the details.

Done! But I'm not sure it matters. As I said in my original post, I'm relocating the coils elsewhere on the bike. What I'd like to do is just buy a couple of meters of ignition cable and cut them to length myself (I've done this before). Only problem is that the end caps / plugs are supposedly "special" for K bikes, and I'm not sure where to get them (MartinW posted a helpful link to some NGK 5KOhm plug-end connectors, but not the coil-end connectors).


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1993 K75 standard
    

8Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 4:05 pm

MartinW

MartinW
Life time member
Life time member
Try the Yellow Pages for custom ignition lead manufacturers or a good auto electrical supplier. We used to have a local manufacturer of leads but now long gone.
Regards Martin.


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K75s Hybrid
    

9Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 4:09 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Spark plug caps are spark plug caps. There are two different types, resistor and non-resistor. The caps on our bikes have metal shells for some unknown reason(EMI shielding?) and a tab that you can grab with pliers to pull them off the plug. IMO, they are typical BMW gross overkill. A lot of people use the NGK caps as well as wires from other sources. As long as the resistance is close, there isn't much difference between plugs/wires to be concerned about.

One nice thing about the NGK caps is that they are made to work with the threaded terminal on the D7EA plugs they spec for the K75 and don't require terminal nuts like the BMW caps do.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

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
    

10Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Thu Feb 18, 2021 6:01 pm

roach374

roach374
Silver member
Silver member
@Point-Seven-five wrote:Spark plug caps are spark plug caps.  There are two different types, resistor and non-resistor.  The caps on our bikes have metal shells for some unknown reason(EMI shielding?) and a tab that you can grab with pliers to pull them off the plug.  IMO, they are typical BMW gross overkill.  A lot of people use the NGK caps as well as wires from other sources.  As long as the resistance is close, there isn't much difference between plugs/wires to be concerned about.  

One nice thing about the NGK caps is that they are made to work with the threaded terminal on the D7EA plugs they spec for the K75 and don't require terminal nuts like the BMW caps do.

This is some great info, thank you! I think I've got the plugs, plug caps and wires sort of figured out. I'm still a bit in the dark about the coil caps though. Are they BMW "special sauce" as well?


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1993 K75 standard
    

11Back to top Go down   K75 Ignition Cables / leads Empty Leads Thu Feb 18, 2021 8:56 pm

daveyson

daveyson
Life time member
Life time member
I think the k75 leads are different for a reason, or why bother.

K75 leads have an air gap, so you should have no Ohms resistance, do you? And are your leads numbered 1,2 and 3?

K100 bikes have two sparks at the same time, one wasted. K75 has only one spark or one wasted spark at a time. I'll guess this is the reason for the air gap. Using different leads might cause excessive current (primary and secondary) which might cause damage.

Threads here show you might go years or decades without noticeable damage.

Your call.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

12Back to top Go down   K75 Ignition Cables / leads Empty Re: K75 Ignition Cables / leads Fri Feb 19, 2021 6:53 am

92KK 84WW Olaf

avatar
Life time member
Life time member
@Point-Seven-five wrote:Spark plug caps are spark plug caps.  There are two different types, resistor and non-resistor.  The caps on our bikes have metal shells for some unknown reason(EMI shielding?) and a tab that you can grab with pliers to pull them off the plug.  IMO, they are typical BMW gross overkill.  A lot of people use the NGK caps as well as wires from other sources.  As long as the resistance is close, there isn't much difference between plugs/wires to be concerned about.  

One nice thing about the NGK caps is that they are made to work with the threaded terminal on the D7EA plugs they spec for the K75 and don't require terminal nuts like the BMW caps do.
Reminds me of my CB500-4 in the 70s. They too had metal shrouds, in torrential rain cylinder 1 and 4 caps tended to short out from the shroud to the head. An annoying feature. 

But on the K its so you can have a metal tab so you can grip it to pull it off the plug. As said, its just a regular plug cap, resistor on 2V Ks and non resistor on 4v Ks. I have replacement leads on some Ks and no tabs on them!


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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