BMW K bikes (Bricks)

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1Back to top Go down    Hello from sunny Denmark on Sat Jun 18, 2016 5:18 am

thormeyer

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I'm new to the forum and new to the BMW K100.. I have work on many older (70's) Honda's, Triumph's and BMW.

I found a BMW K100RS from 1985 with only 9800 km on the clock, wich I had to own!! I ran very well, but it only ran 10-11 km/liter. I pulled the plugs and they were black.

I have had the bike apart and change alot of parts (all the obvious):
- Air filter
- New plugs
- New oil
- New watertemp. sensor
- New themostat
- New fuel regulator
- New fuel and vaccum lines - plus new hose between the crankcase and air intake (small rubber hose with two bends)

But it is still runing VERY rich - I made a small video with it runing: https://www.dropbox.com/sh/jkanleimg3ce506/AAClfmFIl2eDsCZl-WHJeZXaa?dl=0

I'm going to check the fuel pressure - to be sure it is spot on, and if so the next thing I will check are the injectors.

Any other good ideas??? bounce

best regards

Thor

    

2Back to top Go down    Re: Hello from sunny Denmark on Sat Jun 18, 2016 6:28 am

92KK 84WW Olaf

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Welcome to the forum too. 9800km is very low.

I have the same problem at the moment with my 84 K100RT. Fuel was normally about 16km/litre and it changed and is doing about 11-12km/litre at times. I did not change any adjustments yet.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 87,100 miles
1997 K1100LT 58,000 miles
    

3Back to top Go down    Re: Hello from sunny Denmark on Sat Jun 18, 2016 8:49 am

Brad-Man

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Welcome!

If the injectors are not leaking then I believe I would use deoxit on all electrical connections having to do with engine management.

If that doesn't help then check the AFM.


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Toys don't make the man - Man makes the toys....
    

4Back to top Go down    Re: Hello from sunny Denmark on Sat Jun 18, 2016 10:08 am

Viper357

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Welcome Thor from sunny Tasmania Australia



Great forum - lots of very knowledgeable people here. I am sure someone will give you a solution to the fuel issue

Cheers
Gary


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1985 BMW K100RS
    

5Back to top Go down    Re: Hello from sunny Denmark on Sat Jun 18, 2016 10:20 am

Chocolate

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Hello!

1.) 1985 has the old ignition coils, quit common that the aredefect.
2.) have the Valves been adjusted?
3.) have you checked all rubber with break cleaner, spray on the left side, while the engine is running, if you hear changes, the rubber are done/cracked, it's a 1985 bike they should all be changed.
4.) after doing point 3.) and only than, they bike should be synchronized !

By the way, a speedo can be changed, I have K speedos with ZERO km/miles on it, or anything you like. 90% of all early speedos also been changed by BMW.
Your bike looks good so far, as I can see on the Video.

Measuring the break disk gives often a better km/miles reading.

Cheers and enjoy your bike



Last edited by Chocolate on Sat Jun 18, 2016 12:19 pm; edited 1 time in total


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Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
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6Back to top Go down    Re: Hello from sunny Denmark on Sat Jun 18, 2016 12:14 pm

thormeyer

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Hey guys..

Thank you for the warm welcome.. Laughing

Chocolate - I know, but given the condition of the bike I think the km/miles are correct. I think the bike has been a garage bike, that was what the former owner told me.

I think I have loacated the fault. I tested the fuel rail pressure today and is was very high (more than 70 PSI). The fuel regulator is brand new, so I don't belive thats the problem (orig BMW).

Could it be a clog in the return line?? or what could cause this?

best regards

Thor

    

7Back to top Go down    Re: Hello from sunny Denmark on Sat Jun 18, 2016 1:14 pm

k-rider

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Hi Thor
Welcome also from Denmark,

I believe you said you changed All the fuel lines, OpenOffice the gas cap and have a look at the front left inside the tank, then presse the starter button There should be A big squirt of fuel, from the return line if not There is a non return valve that could be blocked


8Back to top Go down    Re: Hello from sunny Denmark on Sat Jun 18, 2016 2:09 pm

k-rider

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Sorry for the short reply,the family needed My attention,
The non return valve, is a small Ball,placed in the stud where the return line connects, i believe the purpose is to keep pressure in the fuel rail.

K-rider


9Back to top Go down    Re: Hello from sunny Denmark on Sun Jun 19, 2016 8:52 am

thormeyer

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Hey k-rider..

the tank I full of gas, so I think I will pull of the return line and try to see if fuel comes ouy when i hit the start button. if not, i will take off the tank, drain it and check all the pipes inside. I dont think my bike has a non return valve. They were removed on 1985 and up.

/Thor

    

10Back to top Go down    Re: Hello from sunny Denmark on Sun Jun 19, 2016 10:28 am

RicK G

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If you supply the VIN then we can tell you all about it.


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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
    

11Back to top Go down    Re: Hello from sunny Denmark on Sun Jun 19, 2016 2:36 pm

88

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thormeyer wrote:Hey k-rider..

the tank I full of gas, so I think I will pull of the return line and try to see if fuel comes ouy when i hit the start button. if not, i will take off the tank, drain it and check all the pipes inside. I dont think my bike has a non return valve. They were removed on 1985 and up.

/Thor
Welcome along, quiet a few from Denmark here too. Put your bike's VIN Number in the signature line and it helps accuarcy of the advice when getting answers on your bike.


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"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

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