BMW K bikes (Bricks)

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1Back to top Go down   Where does it go Empty Where does it go Sat Nov 24, 2012 6:38 pm

eastern_phoenix

eastern_phoenix
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Anyone help please,
There is a small (6mm od) rubber pipe that comes off No1 Throttle body where does the other end go to I can't see even with the tank off. It looks past it's best where is attaches to the throttle body. Many thanks Where does it go 610153

    

2Back to top Go down   Where does it go Empty Oops Sat Nov 24, 2012 6:39 pm

eastern_phoenix

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Should have said K100RT 1886.

    

3Back to top Go down   Where does it go Empty Re: Where does it go Sat Nov 24, 2012 6:42 pm

Inge K.

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@eastern_phoenix wrote:Should have said K100RT 1886.
That`s a really old model, you must search info elsewhere.


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

4Back to top Go down   Where does it go Empty Re: Where does it go Sat Nov 24, 2012 6:50 pm

Inge K.

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@eastern_phoenix wrote:Anyone help please,
There is a small (6mm od) rubber pipe that comes off No1 Throttle body where does the other end go to I can't see even with the tank off. It looks past it's best where is attaches to the throttle body. Many thanks Where does it go 610153
Early models did have a vacum switch connected to TB #1, I think the switch was removed 04/85.

From what i have read on different forums, it can be disconnected w/o any problems.



Where does it go Vacumb10


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

5Back to top Go down   Where does it go Empty Re: Where does it go Sat Nov 24, 2012 9:59 pm

marleydog

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Should have said K100RT 1886.

Isn't that the coal and steam version? 'What a Face'


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1992 K100 RS
    

6Back to top Go down   Where does it go Empty Re: Where does it go Sat Nov 24, 2012 11:30 pm

Ed

Ed
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Dont let these guys take the mickey out of you e-p,
you just sent them looking in the back of the bookcase for text written in ink and quill. silly Embarassed Embarassed


__________________________________________________
1993 K1100RS  0194321         Colour #690 Silk Blue  aka " Smurfette"
2018 Kart upgrade.
Where does it go 10_x_110
    

7Back to top Go down   Where does it go Empty Re: Where does it go Sat Nov 24, 2012 11:47 pm

Two Wheels Better

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@eastern_phoenix wrote:Anyone help please,
There is a small (6mm od) rubber pipe that comes off No1 Throttle body where does the other end go to I can't see even with the tank off. It looks past it's best where is attaches to the throttle body. Many thanks Where does it go 610153

If by "No 1" TB you mean the TB closest to the front of the motor then see Inge's eggsellent 'splanation...but if you mean the back most TB then the vacuum hose goes to the fuel pressure regulator right behind the TB set. Plug off the other three TB vacuum stubs with rubber caps available at any auto parts shop.


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1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '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-Polizei  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

8Back to top Go down   Where does it go Empty Thanks Sun Nov 25, 2012 3:06 pm

eastern_phoenix

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Thanks Inge I had seen this diagramme in Clymers manual I think but it is not very clear as the hose comes of a tapping beside the closed off vacumn Guage (used for synchronising) and bends to the front and disappears behind the air box.
I have read Bertrand Vogels (Crazy Frog) excellent write up on the EFI and I see that the vacumn switch is normally open and when closed by the Vacumn it earths pin 15 of the Electronic ignition module but what for I can see no explanation as to what this does.
My recently aquired K100 had a few problems which I have irones out but on starting it miss fires (not badly) unless I keep the revs up until it warms up. Once warm it ticks over Ok (950 rpm) with an occaisional miss, It goes well and is giving 45 MPG when pushed hard 30 miles of 70 Mph + so there not a lot wrong but this small hose looks a bit grotty and suspect. So do I pull it off and plug it or replace the bit I can see (it is only against the TB that is a bit suspect) and cut it short and put a new piece in with a paralell conector.
Any advise welcome thanks

    

9Back to top Go down   Where does it go Empty PS Sun Nov 25, 2012 3:14 pm

eastern_phoenix

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Oh I forgot to say that the bike will pick up in any gear from 1500 RPM.
Thanks

    

10Back to top Go down   Where does it go Empty PS Sun Nov 25, 2012 4:00 pm

eastern_phoenix

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I should have said that the bike picks up smoothly from 1500 Rpm in any gear,

    

11Back to top Go down   Where does it go Empty Re: Where does it go Sun Nov 25, 2012 5:30 pm

Inge K.

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Have no experience with this vacum switch myself, but from what I have read on other forums...owners have disconnected the hose and not noticed any difference.

I suggest you do the same, and put a rubber cap at the stub....and it could be that it improves the engine cold running,,,if the tatty hose have a small leak.
But this could be tried first, and then we take it from there....

If I remember correctly the switch would advance the timing a few degrees to improve fuel economy, but it probably did close to nothing....since it was discarded after a short time.

Here is a picture of the switch (so you see where the hose ends):

Where does it go Bryter10


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

12Back to top Go down   Where does it go Empty Re: Where does it go Sun Nov 25, 2012 6:04 pm

GerryP

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+1 Inge

I had a bit of a rake-round on the net and as nearly as I can see that switch provides a bit more timing advance on a trailing throttle. Stops the exhaust banging and popping maybe?

On overrun the fuel is shut off anyway.

Small zip-tie on loose hose connections might help.

Best of luck Very Happy


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Safe riding Cool,
Gerry Parnham


K1100LT (1993) in Silk Blue/Cream
http://gerryparnham.com
    

13Back to top Go down   Where does it go Empty Thanks Sun Nov 25, 2012 6:27 pm

eastern_phoenix

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Thanks what you say makes sense i'll give it a whirl.

    

14Back to top Go down   Where does it go Empty Re: Where does it go Mon Nov 26, 2012 4:15 pm

Themason

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The switch in question activated a different advance curve for part throttle. It was effectly useless and discontinued. BMW runs surprisingly aggressive timing on their bikes. It is an area to which they devote more attention than is typical of motorcycle manufacturers.

You can put a TB plug over the spigot, remove the switch from the back of the TB rack, tape over the ends of the wires and secure them somewhere out of the way.


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I live in a parallel universe but have a vacation home in reality :arrow:

1984 K-100RS Alaska Blue w/Parelever and 16V wheels.

1984 K-100RS Metallic Madison stock

1986 R-80G/S w/1000 cc engine

2007 Harley Davidson Street Rod Mirage Orange w/XR1200 wheels, Race Tech, True Track, Works Performance shocks

2007 Harley Davidson Street Rod Vivid Black stock

1993-ish K-100/1100RT/LT hemaphrodite frankenbike thingy to be painted satin black from a rattle can eventually
    

15Back to top Go down   Where does it go Empty Re: Where does it go Wed Jul 21, 2021 9:58 pm

Spexbike

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@Themason wrote:The switch in question activated a different advance curve for part throttle. It was effectly useless and discontinued. BMW runs surprisingly aggressive timing on their bikes. It is an area to which they devote more attention than is typical of motorcycle manufacturers.

You can put a TB plug over the spigot, remove the switch from the back of the TB rack, tape over the ends of the wires and secure them somewhere out of the way.
That sounds like a great solution,I love taking parts off that have no purpose !!!! Razz Razz Razz

http://www.spextattoo.com/
    

16Back to top Go down   Where does it go Empty Re: Where does it go Thu Jul 22, 2021 7:20 am

92KK 84WW Olaf

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You can do that, did it on my 84 K100RT then put it back, but my 83 K100RS also has this and I decided to keep it all original.

Thing is, my 83 RS has the engineering screws but seems to make a difference. My take is the early as in 83 has the earlier camshafts and valve timing and that may be the case as it is much more aggressive to ride. I intend to do a temporary disconnection to see if it makes a difference.

I do see the RS is the most economical of all my Ks, by a long distance regularly hitting 12.5/13 miles per litre, my K100LT doing 10 miles per litre, my K1100LT doing 10-12 miles per litre and my 84 K100RT about 10/10.5 miles per litre so there is a difference from 83 to 84..


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

17Back to top Go down   Where does it go Empty Re: Where does it go Sun Jul 25, 2021 12:49 am

Spexbike

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@Inge K. wrote:Have no experience with this vacum switch myself, but from what I have read on other forums...owners have disconnected the hose and not noticed any difference.

I suggest you do the same, and put a rubber cap at the stub....and it could be that it improves the engine cold running,,,if the tatty hose have a small leak.
But this could be tried first, and then we take it from there....

If I remember correctly the switch would advance the timing a few degrees to improve fuel economy, but it probably did close to nothing....since it was discarded after a short time.

Here is a picture of the switch (so you see where the hose ends):

Where does it go Bryter10
Yup,took mine off and capped it but I am going crazyyyyyyy ! The bike ran about a week ago when I still had overheating problems.I got a new coolant sensor, a used cooling relay,removed the vacuum sensor and plugged the barb on cyl 1 on the throttle body.Bike won't start.No fuel getting to the fuel rail.open the tank ,took the fuel hose that goes to the top of the pump off the filter,pushed start... at this time I should have fuel squirting out of the hose,correct? but nothing.It's a new pump,it worked before,checked the fuse which seemed good,replaced it just to make sure.Even put the old cooling relay back in to make sure that is not the issue,but that shouldn't even have anything to do with the fuel pump,right? SOS !
[ltr] [/ltr]

http://www.spextattoo.com/
    

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