BMW K bikes (Bricks)

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1Back to top Go down    k1200 exhaust on Tue Aug 19, 2014 8:35 pm

KafeRacer

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I just found a crack on my k100 RS 4V exhaust. I am wondering if the k1200rs exhaust will fit. I expect to need to fabricate mounts. I am also not worried about the rear luggage or foot rests as I don't have luggage and will be putting a custom rear set on anyway. My main questions are if it will bolt to the head, I suspect it will, and if it will clear the rear of the transmission before it sweeps up.

I have done some searching but can not find a definitive verdict.

Any help would be great.

Thanks.


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Dave Evans
'Kafe Racer'
kaferacer.wordpress.com

1990 K75RT
1985 K100 Kafe Racer
http://kaferacer.wordpress.com
    

2Back to top Go down    Re: k1200 exhaust on Tue Aug 19, 2014 9:15 pm

RicK G

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YES


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Re: k1200 exhaust on Tue Aug 19, 2014 9:19 pm

KafeRacer

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Excelent, thanks.


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Dave Evans
'Kafe Racer'
kaferacer.wordpress.com

1990 K75RT
1985 K100 Kafe Racer
http://kaferacer.wordpress.com
    

4Back to top Go down    Re: k1200 exhaust on Wed Aug 20, 2014 11:27 am

Two Wheels Better

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The very heavy, upswept muffler will need a mount fabricated up to the rear frame and the very heavy catalyst might conflict with the original centre and side stands. Also, it weighs 28.9 pounds (13+ kilos). I recently took the entire system off my K1200GT. But anything can be done.


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'77 R75/7-1000cc, '87 K100RS, '93 frame w/K12 Big Block, '94 R100 Mystic'04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
    

5Back to top Go down    Re: k1200 exhaust on Wed Aug 20, 2014 8:08 pm

KafeRacer

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Well I just got back from checking out the K1200RS exhaust I found locally. I decided to take the bike along on the trailer to test the fit before I bought it, glad I did since it is not workable.

I can confirm that the bolt pattern on the head is the same, and the exhaust does appear to be able to clear the transmission, however, what I wasn't expecting is the catalytic converter protrusion hits the front of the rear tire. So without extensive modification of the exhaust it will not fit.

The bike has the longer para-lever swing arm but the tire does not clear the protrusion by several inches. I should have taken a photo but forgot to.

I guess now I am in the market for an aftermarket exhaust or the BSK 4-1 Collector.

Cheers.



Last edited by KafeRacer on Wed Aug 20, 2014 10:46 pm; edited 1 time in total


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Dave Evans
'Kafe Racer'
kaferacer.wordpress.com

1990 K75RT
1985 K100 Kafe Racer
http://kaferacer.wordpress.com
    

6Back to top Go down    Re: k1200 exhaust on Wed Aug 20, 2014 9:23 pm

robmack

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How does the K1200 manage the clearance on the cat? I thought it is derived from the same root design -- the classic K.


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1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
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7Back to top Go down    Re: k1200 exhaust on Wed Aug 20, 2014 9:46 pm

KafeRacer

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I know the K1200 has a different transmission, swing arm and rear end, so something must make the distance from the engine to the rear wheel longer. I just looked up some specs and there is almost no difference in overall length between a k1100rs and k1200rs.

K1100rs - 61.6"
K1200rs -61.02"

So the K1200 engine must sit further forward and closer to the front wheel in the K1200 Frame.


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Dave Evans
'Kafe Racer'
kaferacer.wordpress.com

1990 K75RT
1985 K100 Kafe Racer
http://kaferacer.wordpress.com
    

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