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Author Topic: K100 - 87 2 and 4 cyl complete dead  (Read 4035 times)

Offline Anse187

  • Curious
  • Posts: 8
K100 - 87 2 and 4 cyl complete dead
« on: July 03, 2024, 04:47:13 PM »
Hi.

I am out of ideas at this point. Now I need help...  :johnny
4 and 2 cylinder is complete dead. engine works only front cylinders.
-compression pressure is ok every cylinder.
-injectors is ok. Changed places and no changed.
-coil/leads/spark plugs ok.
-valve clearanse is ok. Inside range.
-timing chain is set right.
...Tps, filters etc has been checked...
 I am confused and out of ideas :idunno:

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  • Jns
  • Bmw k100 - 87

Offline frankenduck

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Re: K100 - 87 2 and 4 cyl complete dead
« Reply #1 on: July 03, 2024, 05:20:31 PM »
It's a wasted spark system so 1&4 and 2&3 should fire together.

How are the spark plug leads attached to the coils?

Should be like this:
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Offline Anse187

  • Curious
  • Posts: 8
Re: K100 - 87 2 and 4 cyl complete dead
« Reply #2 on: July 03, 2024, 05:42:24 PM »
I have aftermarket "single" coil at this moment.
I know this is waste spark system so coil failure or Hall wont sound logic to me. But if would know what is the reason I wouldnt ask😄 thanks for reply.
And sorry for bad english. Some of comes from autocorrect...
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  • Jns
  • Bmw k100 - 87

Offline Laitch

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Re: K100 - 87 2 and 4 cyl complete dead
« Reply #3 on: July 03, 2024, 07:20:20 PM »
Tell us the name and model number of the coil.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Anse187

  • Curious
  • Posts: 8
Re: K100 - 87 2 and 4 cyl complete dead
« Reply #4 on: July 04, 2024, 12:31:54 AM »
BSK speedworks coil
(https://www.bskspeedworks.co.uk/k-ignition-coil-ht-leads.html)
I also have old coil's put no change.
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  • Jns
  • Bmw k100 - 87

Offline Laitch

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Re: K100 - 87 2 and 4 cyl complete dead
« Reply #5 on: July 04, 2024, 08:32:33 AM »
Are the HT leads and pin connections set up like the diagram below?

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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Anse187

  • Curious
  • Posts: 8
Re: K100 - 87 2 and 4 cyl complete dead
« Reply #6 on: July 04, 2024, 11:36:45 AM »
Yes. I checked those again.

When I only have 1 and 3 cylinder injectors connected engine works smoother.
When I connected 2 and 4 those just makes randomly missfire. Sound like fireworks start explode.
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  • Jns
  • Bmw k100 - 87

Offline Anse187

  • Curious
  • Posts: 8
Re: K100 - 87 2 and 4 cyl complete dead
« Reply #7 on: July 04, 2024, 11:50:41 AM »
Ou fuck!

Problem solved.
That coil pack information didnt mean ignition order..
1 is 1 and 2 is 2....
Not 1-3-4-2...
No I feel my self stupid..
Thanks for help
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  • Jns
  • Bmw k100 - 87

Offline Laitch

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Re: K100 - 87 2 and 4 cyl complete dead
« Reply #8 on: July 04, 2024, 12:42:28 PM »
The diagram I posted is a screen shot from BSK's installation video. Although the video's subject was their custom ignition system, it also showed where the HT leads were connected on the coil housing terminals. I added the wiring connections based on the positions of the HT leads—2 & 3 in line with black/red; 1 & 4 in line with black/blue. I consider their printed instructions confusing, too; luckily the video clarified it for me. I guess it's working for you, too. Keep us posted.

Onward! 112350
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Anse187

  • Curious
  • Posts: 8
Re: K100 - 87 2 and 4 cyl complete dead
« Reply #9 on: July 04, 2024, 12:55:03 PM »
Yeah. Those printed instructions were short words
 so it misleads me and cost me a lot of extra time for nothing.
But if we look at the good things. Now I'm starting to get to know my bike (first brick)  :laughing1: there have been a couple of other things.
Maybe this weekend I will get the first test drive with the 4-cylinder block  :laughing1:
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  • Jns
  • Bmw k100 - 87

Offline Anse187

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  • Posts: 8
Re: K100 - 87 2 and 4 cyl complete dead
« Reply #10 on: July 04, 2024, 01:01:32 PM »
I havent drive this bike ever When it has worked :laughing1:
I bought this last winter and have made a couple of changes to it. :idunno:
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  • Jns
  • Bmw k100 - 87

Offline Chaos

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Re: K100 - 87 2 and 4 cyl complete dead
« Reply #11 on: July 04, 2024, 01:41:21 PM »
With all the weight loss it should be fine on just the two front cylinders.  And it would have a more interesting exhaust note.
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Anse187

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  • Posts: 8
Re: K100 - 87 2 and 4 cyl complete dead
« Reply #12 on: July 04, 2024, 02:36:07 PM »
Exhaust sound I liked more than now :laughing1:
Exxept missfire/fireworks sound wasnt so nice.
Performance.... Well.. You can drive on traffic...acceleration something similar to that of a normal car.
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  • Jns
  • Bmw k100 - 87
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