BMW K bikes (Bricks)

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1Back to top Go down   Hi from France! Empty Hi from France! Sat Jun 18, 2022 6:44 am

Tinker

Tinker
New member
New member
I've been on this forum for many years, but I couldn't remember my user name so I'm back again having rejoined!!

I have an 87 K100 (I've had it for about 12 years!) with problems!!

I sent this as an email to Bert:-


This is a last resort, I'm at my wits end, my 87 K100 starts well, pulls well up to 2500 / 3000 rpm and then shuts down, hot or cold,

I've changed the plugs fuel pump fuel filter, checked the injectors, fuel pressure OK, (changed and tested pressure relief valve) tested with and without idle switch, I tried another EFI _unit, tested all the pins everything exactly as required!

It's shutting down as though it was over revving any suggestions would be greatly appreciated!

Could it be that despite testing OK at the plug something weird happening with the flow meter?

Cheers, Matthew

    

2Back to top Go down   Hi from France! Empty Re: Hi from France! Sat Jun 18, 2022 6:56 am

moriarti

moriarti
Life time member
Life time member
:welcome:Back Tinker I too had a nightmare problem, cutting out loss of power, the culprit turned out to be the ICU ignition control unit situated under the tank near front of the frame, replaced  it ran like a dream. Hope this helps  Very Happy Very Happy


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1984 k100 rs red/black VIN  0004449
    

3Back to top Go down   Hi from France! Empty Re: Hi from France! Sat Jun 18, 2022 7:45 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Welcome!  I agree with Moriarti.  I believe the ICU is where the over rev protection is implemented.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
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
    

4Back to top Go down   Hi from France! Empty Re: Hi from France! Sun Jun 19, 2022 1:52 pm

bad boy

bad boy
Silver member
Silver member
salut Tinker - welcome back Matthew

bienvenu, Hi from France! 177912



Last edited by bad boy on Mon Jun 27, 2022 1:39 pm; edited 1 time in total


__________________________________________________
Cheerz, David

Hi from France! 9438-010

____________________________________________________________________________
1997 Peraves Super Ecomobile: a Kevlar reinforced monocoque with outrigger wheels, seating two.
K100 fork, monolever, headlight, indicators, K1100RS gearbox and K1200RS 589 engine, rear wheel
    

5Back to top Go down   Hi from France! Empty Re: Hi from France! Fri Jun 24, 2022 2:55 am

Tinker

Tinker
New member
New member
moriarti wrote::welcome:Back Tinker I too had a nightmare problem, cutting out loss of power, the culprit turned out to be the ICU ignition control unit situated under the tank near front of the frame, replaced  it ran like a dream. Hope this helps  Very Happy Very Happy
Thank!

I tried it, no different.

Subsequently, not straight after testing with another ICU it's not starting at all!back to the beginning, so far I've cleaned  the ground connections and all the cable connectors, The fuel pump, the fuel pressure regulator, the injectors tested as good the flow meter tests as good, I'm about to test the water temp and re test the hall sensors, which were the first thing I changed when the problem started! Not much left to try!

Cheers, Matthew

    

6Back to top Go down   Hi from France! Empty Re: Hi from France! Fri Jun 24, 2022 8:30 am

92KK 84WW Olaf

avatar
Life time member
Life time member
Tinker wrote:
moriarti wrote::welcome:Back Tinker I too had a nightmare problem, cutting out loss of power, the culprit turned out to be the ICU ignition control unit situated under the tank near front of the frame, replaced  it ran like a dream. Hope this helps  Very Happy Very Happy
Thank!

I tried it, no different.

Subsequently, not straight after testing with another ICU it's not starting at all!back to the beginning, so far I've cleaned  the ground connections and all the cable connectors, The fuel pump, the fuel pressure regulator, the injectors tested as good the flow meter tests as good, I'm about to test the water temp and re test the hall sensors, which were the first thing I changed when the problem started! Not much left to try!

Cheers, Matthew
Make sure temperature sensor is connected. If you have a poor electrical connection it may alter the mixture or if completely electrically isolated cause a refusal to start. Recheck the ICU connections and clean 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 40,490 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
    

7Back to top Go down   Hi from France! Empty Re: Hi from France! Fri Jun 24, 2022 3:43 pm

Arlina

Arlina
Moderator
Moderator
Welcome back Tinker Smile


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Hi from France! Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

8Back to top Go down   Hi from France! Empty Hi from France Sat Jun 25, 2022 2:57 am

daveyson

daveyson
Life time member
Life time member
Since toying with the ICU made it worse, that would be a good place to look at again. If no help maybe go through Bert's guide until you hit a problem. If you get back to the original problem, unlikely but maybe have a quick look at the alternator plug, that it's clean and snug.


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

9Back to top Go down   Hi from France! Empty Re: Hi from France! Sat Jun 25, 2022 4:32 am

Tinker

Tinker
New member
New member
92KK 84WW Olaf wrote:
Make sure temperature sensor is connected. If you have a poor electrical connection it may alter the mixture or if completely electrically isolated cause a refusal to start. Recheck the ICU connections and clean them.

Thanks, a good idea! that will be my next step! I just went over all the plug in connections and ground points, cleaned and protected them with Vaseline!

What a nightmare

Cheers, Matthew

    

10Back to top Go down   Hi from France! Empty Re: Hi from France! Mon Jun 27, 2022 11:38 am

Tinker

Tinker
New member
New member
daveyson wrote:Since toying with the ICU made it worse, that would be a good place to look at again. If no help maybe go through Bert's guide until you hit a problem. If you get back to the original problem, unlikely but maybe have a quick look at the alternator plug, that it's clean and snug.
Well, I didn't say the ICU made it worse, just it's got worse, but not straight after changing the ICU. I have tested the temperature sensor, not good, I'm waiting for a new one!

Cheers, Matthew.

    

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