BMW K bikes (Bricks)

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1Back to top Go down   K100 Drivetrain Lookover Empty K100 Drivetrain Lookover Sun May 16, 2021 8:31 pm

DevilDesign

DevilDesign
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Hello everyone! I have finally decided to get my K100 out of storage and start to build it. I am coming from 70s CBs, so this whole EFI thing is a bit foreign to me. I want to go through the drivetrain and make sure that everything is up to snuff, as well as get comfortable with the system itself. What sort of EFI specific checks should I do. Or really just any general items that I should look at with these bikes?

Thanks!

    

2Back to top Go down   K100 Drivetrain Lookover Empty Look over Sun May 16, 2021 9:13 pm

daveyson

daveyson
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Hi welcome 

It depends on how long your brick has sat, and if it was stored with ethanol blended fuel. 

It can seem intimidating when you switch to fuel injection systems. Actually they're probably more reliable and less maintenance, maybe cause less moving parts. 

You probably don't have to do anything on the fuel injection side of things. As an example one of my bricks sat for five years unused with ethanol free fuel. I changed fluids, replaced a faulty starter relay and it started within seconds. Another one sat for ten years, it needed a new pump, fuel filter, injectors, and EFI computer. With the help of this forum, you can probably fix all your issues without replacement. 

Good luck with it.


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

3Back to top Go down   K100 Drivetrain Lookover Empty Re: K100 Drivetrain Lookover Sun May 16, 2021 9:28 pm

DevilDesign

DevilDesign
active member
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daveyson wrote:Hi welcome 

It depends on how long your brick has sat, and if it was stored with ethanol blended fuel. 

It can seem intimidating when you switch to fuel injection systems. Actually they're probably more reliable and less maintenance, maybe cause less moving parts. 

You probably don't have to do anything on the fuel injection side of things. As an example one of my bricks sat for five years unused with ethanol free fuel. I changed fluids, replaced a faulty starter relay and it started within seconds. Another one sat for ten years, it needed a new pump, fuel filter, injectors, and EFI computer. With the help of this forum, you can probably fix all your issues without replacement. 

Good luck with it.

I honestly have no idea how long it has sat. I have personally owned it for 2 years now, but I am not sure what its life was like before me. It is just the drivetrain and computer. I picked up wheels and a frame today. Was planning on taking it apart, giving everything a nice clean. And reassembling. Is it okay to clean injectors in a ultrasonic cleaner?

Thank you for the quick response!

    

4Back to top Go down   K100 Drivetrain Lookover Empty Look over Sun May 16, 2021 9:36 pm

daveyson

daveyson
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I haven't cleaned them, but there are threads here about it. I went to the junk yard and got injectors from a six cylinder BMW car that worked. I think injectors from a Hyundai worked too, it was a '97 Excel model.

Workshop manuals and coloured wiring diagrams, available on this forum, were a big help for me. 

If you're able to contact the previous owners, I'd ask as much as possible about its history.



Last edited by daveyson on Thu May 27, 2021 10:09 am; edited 2 times in total (Reason for editing : Delete Lantra, substitute Excel.)


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

5Back to top Go down   K100 Drivetrain Lookover Empty Re: K100 Drivetrain Lookover Mon May 17, 2021 8:11 am

DevilDesign

DevilDesign
active member
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daveyson wrote:I haven't cleaned them, but there are threads here about it. I went to the junk yard and got injectors from a six cylinder BMW car that worked. I think injectors from a Hyundai worked too, it was a '97 model, I think it was a Lantra model.

Workshop manuals and coloured wiring diagrams, available on this forum, we're a big help for me. 

If you're able to contact the previous owners, I'd ask as much as possible about its history.

Alright! Thats actually really nice that normal car injectors will fit. I did not know that was the case!

Thank you very much for your help!

    

6Back to top Go down   K100 Drivetrain Lookover Empty Lookover Mon May 17, 2021 8:44 pm

daveyson

daveyson
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If your junk yard has a web site, you probably want to check first, that model BMW probably doesn't pop up often, cause it was a 1983 520i. I'm sure that injector and part number will be on other models too, from that era. On the net I found a chart comparing it to brick injectors and they were virtually identical. The part numbers are;

0 280 150 208: BMW 520i
0 280 150 210: Brick


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

7Back to top Go down   K100 Drivetrain Lookover Empty Re: K100 Drivetrain Lookover Mon May 17, 2021 9:31 pm

DevilDesign

DevilDesign
active member
active member
daveyson wrote:If your junk yard has a web site, you probably want to check first, that model BMW probably doesn't pop up often, cause it was a 1983 520i. I'm sure that injector and part number will be on other models too, from that era. On the net I found a chart comparing it to brick injectors and they were virtually identical. The part numbers are;

0 280 150 208: BMW 520i
0 280 150 210: Brick

Cool! I have been doing a lot of research today. Sounds like I need to find out how many valves the drivetrain I have has!

I really appreciate your help!

    

8Back to top Go down   K100 Drivetrain Lookover Empty Lookover Mon May 17, 2021 10:52 pm

daveyson

daveyson
Life time member
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You might have an engine number under the oil filler cap. 

On mine it's 104EA 4785 2099. The second set of numbers means it was built on the 47th week of 1985, which also means it's a two valve design.

The Vin number on the frame will reveal its year too. You need two computers, the fuel injection computer which I think you have, and the Ignition Control Unit, on the frame under the tank.


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

9Back to top Go down   K100 Drivetrain Lookover Empty Re: K100 Drivetrain Lookover Mon May 17, 2021 11:57 pm

Holister

Holister
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Start your research by going to realoem.com and enter the last 7 digits of your VIN. You will find production dates and all the parts info you need with diagrams, part numbers and most handy is the parts compatibility with other models. Handy if you're sourcing secondhand parts.
If sourcing parts off ebay for example, you can't rely on the vendor's description. You need the oem part numbers to ensure you're geting the right part for your machine.


Finding suitable aftermarket injectors is difficult. Don't believe vendors that tell you theirs are an upgrade.... that's very doubtful. The Bosch #210 injector was specifically made for the K100 2v. They've been unavailable for a long time and they're now as scarce as hens teeth. It bothers me that some guys chuck them in the bin to install so called upgrade injectors. If looked after they have a life of around 400,000 miles and probably even much more. They're real easy to clean with a can of injector/carby cleaner and an attachment like this...
https://www.ebay.com.au/itm/153787862990?hash=item23ce788fce:g:QAMAAOSwQ4ReE9MW&frcectupt=true
Or take them to a professional injector cleaning service.

0 280 150 208: BMW 520i .... This one is very close in specs to the oem #210
0 280 150 210: Brick

Comprehensive info on everything about the K can be found here.
http://www.kforum-tech.com/


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 K100 Drivetrain Lookover Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

10Back to top Go down   K100 Drivetrain Lookover Empty Re: K100 Drivetrain Lookover Tue May 18, 2021 2:07 am

MartinW

MartinW
Life time member
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I looked into doing a four hole injector upgrade many years ago. A mates son who was an injector specialist at the time looked into it. The single hole injector was designed to spray onto the back of the inlet valve and therefore cool it, four hole injectors will not be as effective. (See picture) If 4 hole injectors are so superior to the single hole injectors why is there no dyno comparisons, and I've looked. Seat of pants dynos are not valid as cleaning your single hole injectors will probably give you a similar boost if the are dirty. A few guys that did report seat of pants boost also reported higher fuel consumption. The chance of blockages in a 4 hole injector is greater than the single hole injector.
Regards Martin.
K100 Drivetrain Lookover Cutawa10


__________________________________________________
K75s Hybrid
    

11Back to top Go down   K100 Drivetrain Lookover Empty Re: K100 Drivetrain Lookover Tue May 18, 2021 8:33 am

Point-Seven-five

Point-Seven-five
Life time member
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MartinW wrote:I looked into doing a four hole injector upgrade many years ago. A mates son who was an injector specialist at the time looked into it. The single hole injector was designed to spray onto the back of the inlet valve and therefore cool it, four hole injectors will not be as effective. (See picture) If 4 hole injectors are so superior to the single hole injectors why is there no dyno comparisons, and I've looked. Seat of pants dynos are not valid as cleaning your single hole injectors will probably give you a similar boost if the are dirty. A few guys that did report seat of pants boost also reported higher fuel consumption. The chance of blockages in a 4 hole injector is greater than the single hole injector.
Regards Martin.
K100 Drivetrain Lookover Cutawa10

+1 A while back I put a set of aftermarket "replacement" injectors in a K100RS I was restoring. They made it hard to start and it ran like crap. A set of used injectors replaced them after I cleaned them with the above fixture and carb cleaner. The bike starts and runs much better wth them.

I'm skeptical of the four hole injectors. The four orifices are 1/2 the size of the standard injectors so in my feeble mind they are at least twice as likely to clog up and have spray pattern issues.


__________________________________________________
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
    

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