BMW K bikes (Bricks)

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1Back to top Go down   '85 K100RT Empty '85 K100RT Tue Aug 22, 2017 7:25 pm

ibwillis

ibwillis
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Having problems with 85 K100RT running not running on #1&4 cylinders. Very similar to what I read on what I believe it was Chocolate Frog's systems. I believe his problem was two bad injectors. I have fire to all spark plugs/cylinders. I can pull the #1  plug wires and no difference in running. Can pull 2 or 3 wires and it kills bike.
I have switched coils and no difference. Tried different plug wires-no difference. Pulled all the injectors, hooked to voltage and sprayed carb cleaner through them and verified they are opening and good stream discharging through them. I have checked each injector lead with a LED lamp and verified injectors are getting a signal. After reassembly took steposcope (bike running)and listen to each injector and could hear each clicking as if they were opening and closing. I have checked under tank frame ground, ignition unit and hall sensor connections. Each one were clean as a whistle and appeared no fault. I was wanting to trouble hall sensors but didn't quiet follow/understand logic from flow chart. Any suggestions would be greatly appreciated.

    

2Back to top Go down   '85 K100RT Empty Re: '85 K100RT Tue Aug 22, 2017 7:47 pm

92KK 84WW Olaf

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If you swapped coils and the problem remains at 1 and 4 then coils are good and problem is in Hall Effect Sensors [HES] or in plug leads.

However plug leads unlikely to both go at same time and much more likely it's HES related. The HES wire goes up over the radiator and worth checking the connector to the loom and also the wire itself as the heat can cause it to fail after 30 odd years. If you have a spare HES plate or set it's worth swapping them.

Have you opened up the HES cover to see what's in there?


__________________________________________________
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 42,640 miles.

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
    

3Back to top Go down   '85 K100RT Empty Re: '85 K100RT Tue Aug 22, 2017 7:53 pm

robmack

robmack
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...



Last edited by robmack on Tue Aug 22, 2017 11:45 pm; edited 1 time in total


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

4Back to top Go down   '85 K100RT Empty Re: '85 K100RT Tue Aug 22, 2017 10:47 pm

helensmellen

helensmellen
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i know this might sound like a stupid answer, but my other half had a similar problem and found that it would only run when the throttle was turned and the starter on. he found out by trial and error that the fuses were loose. The engine wouldnt idle or it would cut out and sound like a bag of spanners and would only fire up and not lose power when the starter is pushed... it turned out to be a pants connection on the fuse.... his words, not mine

    

5Back to top Go down   '85 K100RT Empty Re: '85 K100RT Wed Aug 23, 2017 5:52 am

KJustin

KJustin
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Having been through what you are describing myself, and knowing how maddening it can be, I'd suggest that in addition to checking the various plugs, grounds, etc., that you also clean them with De-Oxit to be sure.  Sometimes even if they look clean, they can still be a problem.  

I agree with Olaf that your problem sounds like it's with the Hall Effect Sensors (HES).  However, I'd also double check (after cleaning both sides with De-Oxit) that the plug to your ICU (under the tank, at the head stock) is firmly and completely seated.  I had a non-firing 1-4 cylinder situation and found that the plug was firmly attached on one side but knocked slightly loose on the other and that this was my issue.  Of course I only discovered this after several weeks of testing everything else under the sun.  Best of luck!


__________________________________________________
1985 K100 Cafe Racer (formerly an RT), VIN 0051736
    

6Back to top Go down   '85 K100RT Empty 85'K100RT Wed Aug 23, 2017 11:58 am

ibwillis

ibwillis
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Have not pulled HES cover, do not have spare. After I pull cover how do I check? LED lamp on pins two & five? I'm I in fifth gear and turning motor over to check signal? If HES is removed is this where I reset signal at "X" degrees before TDC? (Don't remember exactly what timing is set at off top of my head)

    

7Back to top Go down   '85 K100RT Empty Re: '85 K100RT Wed Aug 23, 2017 5:20 pm

robmack

robmack
Life time member
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Hall Sensor Test Procedure for Oilheads .  Is the same for Bricks.
Making a Hall Sensor Test Rig .  Also a similar test rig is detailed in this K100-forum post


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

8Back to top Go down   '85 K100RT Empty Re: '85 K100RT Wed Aug 23, 2017 6:35 pm

92KK 84WW Olaf

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@KJustin wrote:Having been through what you are describing myself, and knowing how maddening it can be, I'd suggest that in addition to checking the various plugs, grounds, etc., that you also clean them with De-Oxit to be sure.  Sometimes even if they look clean, they can still be a problem.  

I agree with Olaf that your problem sounds like it's with the Hall Effect Sensors (HES).  However, I'd also double check (after cleaning both sides with De-Oxit) that the plug to your ICU (under the tank, at the head stock) is firmly and completely seated.  I had a non-firing 1-4 cylinder situation and found that the plug was firmly attached on one side but knocked slightly loose on the other and that this was my issue.  Of course I only discovered this after several weeks of testing everything else under the sun.  Best of luck!

This seems to be a common issue too. Now I tell people to go to this fix the plug connection first as its easy, no parts required.


__________________________________________________
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 42,640 miles.

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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