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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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 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 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '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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Robert
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.


__________________________________________________
Dave Evans
'Kafe Racer'
kaferacer.wordpress.com

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

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