BMW K bikes (Bricks)

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1Back to top Go down   Frame compatibility Empty Frame compatibility on Tue Jan 12, 2016 2:19 pm

clark_sas

clark_sas
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Are K100 and K75 frames interchangeable provided the year is within the same group? Thinking about a future project building from the ground up...


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1987 K100RS
    

2Back to top Go down   Frame compatibility Empty Re: Frame compatibility on Tue Jan 12, 2016 2:29 pm

Two Wheels Better

Two Wheels Better
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I think you'll find that 'missing' cylinder will make the mounting points not able to be aligned between K75 & K100. K100 frames will fit the K100-16V, K11 and K12 engines, however.


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“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

3Back to top Go down   Frame compatibility Empty Re: Frame compatibility on Tue Jan 12, 2016 2:56 pm

92KK 84WW Olaf

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I remember posts on the engines being a fit but am I right in thinking the K1200 6 speed gear box [as opposed to the 5 speed K100/K1100] has a different frame mounting point?


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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.
    

4Back to top Go down   Frame compatibility Empty Re: Frame compatibility on Tue Jan 12, 2016 2:59 pm

clark_sas

clark_sas
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Yes, I can see how that may present an issue. Thank you for your response!


__________________________________________________
1987 K100RS
    

5Back to top Go down   Frame compatibility Empty Re: Frame compatibility on Tue Jan 12, 2016 4:07 pm

Two Wheels Better

Two Wheels Better
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@92KK 84WW Olaf wrote:I remember posts on the engines being a fit but am I right in thinking the K1200 6 speed gear box [as opposed to the 5 speed K100/K1100] has a different frame mounting point?
You can attach a five speed intermediate case to the K12 in place of the six speed version, use various pieces of both K11 & K12 clutches, as well as a merging of sprag clutch pieces, and the earlier K gearbox works just fine (on K12 motors) in a K100/K11 frame - I used a Paralever final drive and K1100RS gearbox on mine.



Last edited by Two Wheels Better on Wed Jan 13, 2016 2:04 pm; edited 1 time in total


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

6Back to top Go down   Frame compatibility Empty Re: Frame compatibility on Wed Jan 13, 2016 6:02 am

TacKler

TacKler
Life time member
Life time member
@clark_sas wrote:Are K100 and K75 frames interchangeable provided the year is within the same group? Thinking about a future project building from the ground up...

As far as I know, all the K100 frames should be the same, and all K75 frames should be the same.  However the engine mounting points should be different.  4 cylinders as against 3 cylinders. 

However browsing the Haynes manual (2 valve models) it gives the overall length as 2220mm (87.4in) and the wheelbase as 1511mm (59.5in).  Assuming this is for both K100 and K75 models I am unsure if there are differences in steering geometry or elsewhere. 

Perhaps one of our members who own both a K100 and K75 can race out to the garage with a tape measure and provide the definitive answer?  A cold schooner of Tooheys Old on the Kosciusko Run for the winner.  Frame compatibility 905546712


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Red 1991 K75S
    

7Back to top Go down   Frame compatibility Empty Re: Frame compatibility on Wed Jan 13, 2016 1:00 pm

Motorbike Mike

Motorbike Mike
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If you look at a K75 frame, the front down tubes that go to the front engine mounts are at a shallower angle to allow them to go back further to the shorter K75 engine.
There will obviously be other differences but without getting the hacksaw and brazing torch out, the two won't mix.

    

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