BMW K bikes (Bricks)

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audibob

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Quote from Dai dated friday 13th 2016


I did two things on mine: advanced the timing by four degrees (thanks Rick!) and fitted a set of K1100 throttle bodies. SOTP says it's kicking out four, maybe five more BHP than standard i.e. I felt the difference and standard wisdom has it that the rider's backside can't feel less than a four bhp increase. If it's a K100RS then retrofitting the standard K100 bevel drive will also get you a bit more kick (lower gearing).

Is it worth it? Dunno, but it's fun doing it! 

Also, screwing the nuts off it in third gear definately helps. Mine does 60-90mph in minus three seconds. Well, it feels that way!



I fully concur with Dai, although my FD is a 33/11 , taller geared, but 1100 tbs and timing tweak done,  I can drop her into 3rd at 70 , and wound her open. and wow.... affraid

 the result is quite startling . She really pulls hard, more than I expected.. 

Three figures comes up very quickly. 

Great fun, addictive too.


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Yamaha 90
Honda CD 175
Honda CB 360 
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

Dai

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Yeah... 60-90mph comes up in a stupid rush... Very Happy Very Happy


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

Snod Blatter

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@audibob wrote:I fully concur with Dai, although my FD is a 33/11 , taller geared, but 1100 tbs and timing tweak done,  I can drop her into 3rd at 70 , and wound her open. and wow.... affraid

 the result is quite startling . She really pulls hard, more than I expected.. 

Three figures comes up very quickly. 

Great fun, addictive too.
Don't they all do this anyway? I mean, surely yours doesn't just do it now you've tweaked it a bit?


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1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

92KK 84WW Olaf

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The K75 final drive will also work, if its a 20 spline shaft, if not you need a shaft as well.


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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 69,000 miles
    

Dai

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@Snod Blatter wrote:
@audibob wrote:I fully concur with Dai, although my FD is a 33/11 , taller geared, but 1100 tbs and timing tweak done,  I can drop her into 3rd at 70 , and wound her open. and wow.... affraid

 the result is quite startling . She really pulls hard, more than I expected.. 

Three figures comes up very quickly. 

Great fun, addictive too.
Don't they all do this anyway? I mean, surely yours doesn't just do it now you've tweaked it a bit?
A standard K100 feels like a bit of a slug compared to the mildly-tweaked version. I tried my two back-to-back and Brick2 felt like it was going nowhere compared to LFB. The tweak seems to put much more in the midrange where it's really needed.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

audibob

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Having done the 1100tbs and the timing tweak , there was a definite increase in mid range response.

The other change I did was to adjust the TPS as far retarded as I could to stop the fuel being cut off at lows revs, 

which meant that the second trigger should occur a little sooner on the throttle opening than with the standard TPS set up.

I would not normally drop her two gears and wind her open, thats not my usual style of riding, usually relying on roll on power , which is also good.

I did it once before the tweaks and wasnt overly impressed, but now she pulls really well.

So for me, the three tweaks have combined to make difference.

I will still ride like an old fart on a LT, but I now know what lies beneath if ever I want to have some fun.

If I rode an RS , I probably would be tempted to open her up more often.

Bob


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Yamaha 90
Honda CD 175
Honda CB 360 
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

Point-Seven-five

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I've heard of this tweak, does it work for the K75 engine?  Would like to tweak my K75's, as since riding my 16v K100RS they feel a bit heavier than the K100.


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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
    

MartinW

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Apparently hitting the starter button is also supposed to give you a bit of a boost. It enriches the mixture, I haven't tried it, I just drop a couple of gears. However I experienced a definite improvement by cleaning all my injectors and getting the correct spray pattern.
Regards Martin.

    

Inge K.

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@MartinW wrote:Apparently hitting the starter button is also supposed to give you a bit of a boost. It enriches the mixture,

Then you first must select neutral, or pull the clutch.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

RicK G

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The 4° advance works well on any of the bricks. The base idle timing is left at 6° BTDC because if it is advanced any further than that the engines don't pass the pollution tests.
Unfortunately most engines are being made now days that they cant be advanced any further because the trigger mechanism cant be moved.
With the North American model 8V engines if you really want some bottom end torque then advance the inlet cam a tooth (10.5°) however you will miss out a bit in the top end HP department.
 Same can be done for the North American and Australian model K1100 16V but not the K100 16V engines.
Or buy a set of 16V cams from Europe which open the inlet 20° earlier and will still give you good top end.


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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
    

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