BMW K bikes (Bricks)

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1Back to top Go down   Did I make an expensive mistake?  Empty Did I make an expensive mistake? on Tue Jul 28, 2020 9:29 pm

deanmarine

deanmarine
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Hi all I am starting a k100 scrambler project and it started life as a 1986 RT
The tank is awful and the fork stanchions are shot . I brought a 1983 k100 naked for spares I don't gunk(?) the forks or the tank is a straight swap . I was hoping to keep CDI black boxes etc as spares . Did I mess up ? Please advise

    

2Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Tue Jul 28, 2020 9:58 pm

RicK G

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The forks should be interchangeable but not the tank, they changed the fuel gauge and return line in Sept 85 the electrical parts are mostly the same especially the ICU (Ignition control unit) and ECU (Engine Control Unit or Fuel Injection Control unit)
realoem.com is a good starting place for parts identification


__________________________________________________
"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
    

3Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Tue Jul 28, 2020 10:08 pm

deanmarine

deanmarine
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Thank you for getting back to me the tank I have is very dented but the bike runs lovely the 83 tank is in good condition , what a shame . I was planning on keeping the e throttlesthrottle bodiesrbodies starterb motor etc as a just incase for my 86 it's possible a lot of it is not compatible I guess

    

4Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Wed Jul 29, 2020 12:40 am

RicK G

RicK G
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You could use the other tank but it will require some wiring changes and maybe the fuel gauge wont work as the early ones were part of the reason for the change The throttle bodies are the same. It is worth having for spares even if some parts don't interchange easily.


__________________________________________________
"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
    

5Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Wed Jul 29, 2020 3:04 am

chris846

chris846
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As Rick says - the fuel senders are completely different and you will see this as soon as you compare the undersides of the tanks. The senders aren't swappable.
If your planned bike isn't going to use the original instruments (which contain the circuitry to match the senders), then it won't matter a jot which tank/sender you use, but it will be quite a challenge to get a 83 fuel level sender to drive any sort low level warning light (e.g. extracting the driver circuit from the 83 instruments and adapting it) Even if you do this, the 83 fuel level sender only gives two outputs: 'Low' and 'Really Low' - it will not drive a gauge.
If your project is going to use the original instruments then you have a few few options - but these involve dismantling the two sets of instruments and swapping bits and pieces over. Fairly ambitious, definitely tedious, all good fun, very doable, and you will have assistance every step of the way from the fine guys on this forum who have all trodden these paths before... Smile
What have you got in mind?


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Sometimes I'm not really Suzi Quatro.
    

6Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Wed Jul 29, 2020 7:41 am

92KK 84WW Olaf

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A good 83 tank complete is valuable!! See if you can engineer selling that one and getting a later one that you need.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska 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 105,200 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

7Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Wed Jul 29, 2020 8:04 am

Point-Seven-five

Point-Seven-five
Life time member
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I think if they were mine, I would use the '83 bike for the project and keep the '85 for parts.  The '83 has the tank and harness to support the fuel level sensor. 

The fact that the sender is obsolete and no longer available shouldn't be a big deal.  I doubt the conversion will be used long enough to outlive the sender.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
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
    

8Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Thu Jul 30, 2020 7:39 am

92KK 84WW Olaf

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An 83 K is considerably 'hotter' than an 85 K too........

But bear in mind there are a lot of minor detail changes even from 83 to 84.....brake calipers differ but interchangeable for one, the repair kits are NOT interchangeable.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska 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 105,200 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

9Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Thu Jul 30, 2020 7:50 am

deanmarine

deanmarine
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How do you mean hotter

    

10Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Thu Jul 30, 2020 8:40 am

RicK G

RicK G
VIP
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The intake cam opens 20° earlier than the later cams. They were changed to meet the Californication emission laws. It effectively lowers the compression ratio so that the burn isn't as hot. The later K100s are slightly down on low end torque and Horsepower


__________________________________________________
"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
    

11Back to top Go down   Did I make an expensive mistake?  Empty Re: Did I make an expensive mistake? on Thu Jul 30, 2020 10:06 am

jbt

jbt
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I never heard about this. If you have documentation about, I'd be glad to learn more.

    

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