BMW K bikes (Bricks)

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Matthew-Brisbane

Matthew-Brisbane
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Posted for another rider 
Vic the green cafe racer 

Workshop   & Breakfast to get an old girl running  - Needs help  Bmw_wo10
My bike is a 1985 K100 RS that I bought from a fellow in Maryborough.
It has done about 50,000 kilometres, started and ran nicely, and was a project bike for my daughter who was moving to her second bike with her open license.
I stripped everything off the bike and was left with the engine sitting on two besser blocks. The air box and throttle bodies were not removed.
All tappet clearances were good except for one exhaust shim clearance which was under spec. The water pump seal was replaced. Injectors cleaned and bench tested the backyard way. I had prob-lems with the first restart because I fitted the fuel lines the wrong way. I thought the pressure line went straight to the fuel pressure regulator. When I switched those around she started up and ran perfectly. I rode the bike around the back streets with no issues except for an intermittent short circuit in the right hand indicator circuit.
After swinging the tank 90 degrees to check wiring and sorting the indicators, I found the bike hard to start.

Symptoms:
Would start but there was no response when the throttle was opened and engine would eventually stop. Sub sequent attempts to start resulted in occasional backfires. Removed plugs and they were wet. I got a few short runs when I disconnected the tank and sprayed some Start U Bastard in the air box. I’m not sure if I have good spark because I might not have used the correct procedure to check the plugs.
I have a spare ECU, injector unit and hall sensor and will fit a new battery to the bike for the work-shop.


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1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

Arlina

Arlina
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Fuelpump running? Check the connector.
Tempsensor under the radiator good? Check connector too, and all earthlines.


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Workshop   & Breakfast to get an old girl running  - Needs help  Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project
    

Dai

Dai
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Sounds just like my screw-up recently. If the loom is still standard, on the left side of the bike just before the ECU there's a five-pin connector with four wires in it, probably buried under the main loom. If that's partly disconnected you'll get exactly what's described.

Other (and more likely) probablility is as Arlina says; the fuel pump connector on the left side of the tank isn't making contact(s) properly.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

RicK G

RicK G
VIP
VIP
My immediate thought was the fuel pump connector A K will run and start when warm with the pump disconnected as the manifold vacuum is enough to draw just enough fuel through to let it run but stall as soon as the throttle is opened.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

TacKler

TacKler
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@RicK G wrote:My immediate thought was the fuel pump connector A K will run and start when warm with the pump disconnected as the manifold vacuum is enough to draw just enough fuel through to let it run but stall as soon as the throttle is opened.
+1 

Upon twisting the tank 90 degrees the connectors on the right rear would disconnect themselves?


__________________________________________________
Red 1991 K75S
    

Matthew-Brisbane

Matthew-Brisbane
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Life time member
Thanks for the tips   

Martin , Myself hopefully a few other  ( open invitation )  will go over and see if we can get it to run  for Vic and his daughter


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

Matthew-Brisbane

Matthew-Brisbane
Life time member
Life time member
just a reminder  

Vic is holding a workshop this weekend  open   invite  


Workshop   & Breakfast to get an old girl running  - Needs help  Bmw_wo11


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

StandardK

StandardK
Silver member
Silver member
Jawohl, I will be attending

Regards

Dan

    

Matthew-Brisbane

Matthew-Brisbane
Life time member
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@StandardK wrote:Jawohl, I will be attending

Regards

Dan
Workshop   & Breakfast to get an old girl running  - Needs help  112350


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

Mick67

Mick67
Silver member
Silver member
I intend to attend.

Will be interesting to go through the troubleshooting process.

See you there.

Mick


__________________________________________________
K100RS 1984
VIN 0013414
    

MartinW

MartinW
Life time member
Life time member
Matt I've got a yes from the slacko navy guy.
Regards Martin.


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K75s Hybrid
    

Matthew-Brisbane

Matthew-Brisbane
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Life time member
@MartinW wrote:Matt I've got a yes from the slacko navy guy.
Regards Martin.
Workshop   & Breakfast to get an old girl running  - Needs help  112350


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

Matthew-Brisbane

Matthew-Brisbane
Life time member
Life time member
Thank you to every one who came along 

Its great to be able to say that the bike is now running and starting  with a press of the button 

Thanks charlie for the info on the phone


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

MartinW

MartinW
Life time member
Life time member
Had a great day today and a successful outcome. However currently my Brick is being held for ransom, so until I spring for springs I'm stuck using four wheels.  
Regards Martin.
Workshop   & Breakfast to get an old girl running  - Needs help  P6280110


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K75s Hybrid
    

Matthew-Brisbane

Matthew-Brisbane
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Life time member
Is that the snap ?


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

MartinW

MartinW
Life time member
Life time member
Yup it's supposed to be in one piece, there are two of them, one either side. The neighbor across the road works for Brisbane Garage Door's, so he is getting me a price on replacing both springs. He's a replacement for the mobile Hydraulic guy. Ya can't loose all the time.
Regards Martin.


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K75s Hybrid
    

Mick67

Mick67
Silver member
Silver member
G'Day,

A few pics from this mornings workshop.

What was it in the end?....Temp Sensor connector?

Sorry for leaving before job was done....but I am more scared of my wife than you lot.

Good to see camaraderie and fellowship and helping someone out and a lot of laughs while doing it.

Thanks for the Breakfast Vic.

Cheers Mick

All the cracks had gathered to the fray..

Workshop   & Breakfast to get an old girl running  - Needs help  20200612

Workshop   & Breakfast to get an old girl running  - Needs help  20200611

Surgical precision...

Workshop   & Breakfast to get an old girl running  - Needs help  20200610


__________________________________________________
K100RS 1984
VIN 0013414
    

MartinW

MartinW
Life time member
Life time member
Mick if you hadn't left out of fear you'd now know what the problem was. Only those who stayed have had the benefit of enlightenment. We have now been sworn to secrecy, under the threat of disembowelment with a blunt soup spoon.
With regrets Martin.


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K75s Hybrid
    

Matthew-Brisbane

Matthew-Brisbane
Life time member
Life time member
Bugger I was about to tell him  as you were writing that


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

MartinW

MartinW
Life time member
Life time member
Matt let him ponder the error of his way's (fear of the wrath of wife). With suitable contrition and time all may be revealed.
Regards Martin.


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K75s Hybrid
    

StandardK

StandardK
Silver member
Silver member
Good pics Mick, hat’s off to the hardcore K’ers, was still drizzling & miserable when we packed up after the “success”, was nice & dry inside the ute Rolling Eyes , I have no excuse Embarassed

Martin & Matt, you are evil....don’t leave poor Mick hangin’ , he’ll never sleep again Razz

Matt traced the main issue to a hidden harness plug under the tank related to the temp sensor circuit, the terminal had been pushed out of the back of the plug. That in conjunction with the other electrical gremlins found made for one grumpy K that was never going to run. After starting with no throttle fettling at all each cyl was allowed to kick back in (killing every mozzie in Vic’s street for the next decade) until the fast idle could be gently tweaked and all running on all 4.

Looks like after a few identified issues to sort by Vic in the future it looks like a really good bike, was a nice quiet runner without the usual K rattles etc.

Great effort by all who attended IMO. 

Regards

Dan

    

MartinW

MartinW
Life time member
Life time member
Ratz Dan, Mick needs to learn who is the more important his wife or us. 
Regards Martin.


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K75s Hybrid
    

StandardK

StandardK
Silver member
Silver member
😂😂😂😂😂😂😂😂 well, there may be truth in that, if there’s a motionless blue K sitting forlornly 100KM out of Roma....

Regards

Dan

    

Dai

Dai
Life time member
Life time member
@StandardK wrote:Matt traced the main issue to a hidden harness plug under the tank related to the temp sensor circuit, the terminal had been pushed out of the back of the plug.
Well bugger me! You mean I was right, but for the wrong reason - ! There's a first. Very Happy


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

Matthew-Brisbane

Matthew-Brisbane
Life time member
Life time member
@Dai wrote:Sounds just like my screw-up recently. If the loom is still standard, on the left side of the bike just before the ECU there's a five-pin connector with four wires in it, probably buried under the main loom. If that's partly disconnected you'll get exactly what's described.

Other (and more likely) probablility is as Arlina says; the fuel pump connector on the left side of the tank isn't making contact(s) properly.

Dai  you were spot on it was connector you stated 

The pin had move back just  far enough not to make contact with it mate in the other connector even when the connectors pushed together


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

Mick67

Mick67
Silver member
Silver member
Well done. Good troubleshooting. Vic will be stoked.

It was good to see a logical trouble shoot in action. When I left you knew you had no continuity to temp sensor, good work in finding the break.

Learned a  lot and no longer scared of temp sensors....still extremely scared of wife


__________________________________________________
K100RS 1984
VIN 0013414
    

MartinW

MartinW
Life time member
Life time member
On the Brick again, I had to attend the workshop on four wheels as my garage door spring snapped as I was about to leave. Luckily my new neighbor does garage door installations, 15 minutes this arvo and I'm back on the road again Yeeeee Haaaa.
Regards Martin.


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K75s Hybrid
    

Michael Sydney

Michael Sydney
Silver member
Silver member
Hey guys, well done. I better ask where this mysterious faulty connector is. I have some running problems  too. 
I should start a new thread about this, but will first do a search of the forum. I expect the answer I  seek us out there somewhere!


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Living in the past! K100 '83 and R65 '83.
    

MartinW

MartinW
Life time member
Life time member
The connector with the faulty pin connection is under the tank on the left hand side. It's a five pin connector it is located on the Haynes wiring diagram 70mm down from the top of the page and 75 mm in from the righthand edge of the page with the following colours and markings starting from the top U purple 15 green red tracer going to purple 86 black yellow tracer T pink green tracer TD yellow.
Regards Martin.


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K75s Hybrid
    

Michael Sydney

Michael Sydney
Silver member
Silver member
Thank you Martin. Tomorrow I will embark on a search to find my fault!


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Living in the past! K100 '83 and R65 '83.
    

MartinW

MartinW
Life time member
Life time member
Michael start a new post and describe the fault.
Regards Martin.


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K75s Hybrid
    

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