BMW K bikes (Bricks)

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1Back to top Go down   K1100 / K1200 difference. Empty K1100 / K1200 difference. Sat Jul 30, 2022 7:03 am

UnipowerGT

UnipowerGT
active member
active member
To accommodate a longer throw crank, does the K1200 engine have different pistons, or different con-rods, from the K1100 ?

    

2Back to top Go down   K1100 / K1200 difference. Empty Re: K1100 / K1200 difference. Sat Jul 30, 2022 7:33 am

RicK G

RicK G
admin
admin
The 1200 has longer stroke and shorter rods. The K1100 engine will have black engine covers and the 1200 silver.


__________________________________________________
"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 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

3Back to top Go down   K1100 / K1200 difference. Empty Re: K1100 / K1200 difference. Sat Jul 30, 2022 11:35 am

UnipowerGT

UnipowerGT
active member
active member
RicK G wrote:The 1200 has longer stroke and shorter rods. The K1100 engine will have black engine covers and the 1200 silver.

Thank you for a very swift reply which answers a major question.
My cover is black, so when I come to rebuilding that one, it looks as though I'll need an 1100 crank and bearings.
I see that somebody does oversize pistons for the Boxer, are they available for the K series ?

    

4Back to top Go down   K1100 / K1200 difference. Empty Re: K1100 / K1200 difference. Sat Jul 30, 2022 11:49 am

moriarti

moriarti
Life time member
Life time member
To my knowledge the Ks blocks have a special coating that lasts a lifetime, making Reboreing  not possible, the piston rings are made to were out rather than the bore. Some pistons have ring pins some dont.  Very Happy Very Happy


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1984 k100 rs red/black VIN  0004449
    

5Back to top Go down   K1100 / K1200 difference. Empty Re: K1100 / K1200 difference. Sat Jul 30, 2022 2:34 pm

UnipowerGT

UnipowerGT
active member
active member
moriarti wrote:To my knowledge the Ks blocks have a special coating that lasts a lifetime, making Reboreing  not possible, the piston rings are made to were out rather than the bore. Some pistons have ring pins some dont.  Very Happy Very Happy

Hmph.  That is about as useful news as hole below the water-line.
The bores look like a VW Dune-buggy that has had a mouthful of grit, and what ever the special coating is, it doesn't look special any more.

I wonder, if when he opened it up and saw the damage, he was going to substitute the K100 engine, because all the parts seem to be there, but there are no injectors, starter or alternator among the 1100 parts. 
The poor old boy had a stroke about 20 years ago and that probably killed his plans.
I seem to have got answers the first day I'm here, to my initial questions, but not the ones that I'd hoped to hear.

    

6Back to top Go down   K1100 / K1200 difference. Empty Re: K1100 / K1200 difference. Sat Jul 30, 2022 4:46 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
If visible and within eyeshot, the easiest way to determine whether K11 or K12, is to look at the engine series/number on the right rear of the block, vertically stacked behind the sump fins.

K1100 are 112 followed by FA & engine sequential numbers, K12 are 124 followed by EA & engine sequential numbers.


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1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '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-P & 2022 S1000XR



"We take our bearings, daily, from others. To be sane is, to a great extent, to be sociable."

~John Updike.
    

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