BMW K bikes (Bricks)

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Motorbike Mike

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I was chatting to a very well known BMW engine specialist while we were having a poke around a K1100LT I'd bought earlier this year.





He looked where the headers joined the collector box and commented that they weren't cracked. He then went on to tell me that when the Police used to run the K11's, they would place a Jubilee or worm drive clip just ahead of the collector to move any resonance away from the welded joint, that's why the headers to crack.
I took his advice on board and did just that in the hope of keeping my exhaust in perfect working order; see below.




I just thought I'd pass this tip on because for the price of the parts needed, it's worth a try.

Mike.

    

Ringfad

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Thanks Mike

Prior to my Norway trip earlier this year (K1100RS)I had to remove the exhaust (to clean and adjust the clutch actuator).

Unfortunately one of the pipes was loose and required a bit of stainless welding.

I know what I will be doing now tohopefully stop this re-occurring.


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;BMW;K100RS Style Black 1987 105K Km ;BMW; K1 Black 1993 51KKm ;BMW;K1100RSRed 1993 70k miles ;BMW; K100 16V Black (ex ElectricMonk)
    

blaKey

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Worth a shot!

Thanks Mike!


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Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

Remember Rule No. 6
    

Gaz

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Rosskko might be keen to try that little clamp addition on his K1100.


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Gaz
95 K1100LT 0232224; 90 K75 6427509; 87 R80G/S PD 6292136
    

RicK G

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I will be sure to give it a go. I have also heard they weld a strap welded across the four pipes as close to the ports as possible while still being able to get the nuts on, it probably has the same effect



Last edited by RicK G on Sun Dec 06, 2015 8:20 pm; edited 1 time in total (Reason for editing : PPOhat Ffingers)


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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 for now
    

sidecar paul

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I've got a similar clamp on my outfit; sc25 the weld at the silencer is cracked and the Jubilee clip stops the rattle, it's been there for more years than I care to remember.

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
....No CARS never ever!
    

Point-Seven-five

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Any updates on header cracking with the jubilee clamps? I just bought another K100RS4V with an uncracked factory exhaust and will be installing a clamp.

On my old K100RS4V the exhaust was replaced for cracking under warranty 3 times in the first four years. I finally installed an 8V K100 exhaust that worked quite nicely despite being a bit of a bother to get installed.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

92KK 84WW Olaf

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I got tempted by the 8v exhaust option for the K1100LT but in the meantime a complete brand new Remus fell into my hands for very reasonable money.

I now have the old K1100LT exhaust with only one header attached........ keeping eye out for a collectorbut I alsoseem to have a complete 8v exhaust in my shed.


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1992 K100LT 0193214 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 80,700 miles
    

duck

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It's also been recommended over at K11OG that keeping all of the attachment points and header flange nuts properly torqued is a good idea. (Like checking them every time you do an oil change.)

Can't hurt. Cool


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Motorbike Mike

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The exhaust on my K11 is still sound.
It could be a coincidence but I'm leaving the Jubilee clip in place.

    

Point-Seven-five

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That's good news Mike, I'll get the torque wrench out and retighten all the fasteners and install the jubilee clamp. My first K100 four valve had a Remus, and I found the exhaust note a bit embarrassing when motoring slowly through town. I really don't want to ever need an aftermarket exhaust on my bikes.

If I wanted to make a lot of noise I'd have bought a Hardly Dangerous.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

duck

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FYI: There's two versions of the Remus. The one on my K11RS is just slightly louder than stock.

Staintunes are pretty quiet too.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

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