BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down    k100 cafe racer running problem on Thu May 25, 2017 4:05 am

tyetye

avatar
active member
active member
HELP.....

ive not long finished my cafe racer project but seem to have a problem.. firstly i need to stay ive changed the air intake and it practicly has no exhaust now. looks good and sounds te bollocks but i have a flat spot mid range.
it rides fine at low revs and goes like a missle when i open the throttle but if i try to hold the throttle mid range, its flat , almost feels like a misfire. the throttle bodys have been balanced and the airflow meter has been adjusted to compersat the K&N air filter, valve clearances are ok, new plugs and leads seem to be good. TPS is working and adjusted correctly.
im at a loose end???????
its not stopping me from enjoying the bike but would like to get to the bottem of the problem.
if someone can also tell me how to add pictures to the thred i will.
thanks.

    

2Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:13 am

Chocolate

avatar
Life time member
Life time member
Hello!

Try this link
How do you post a picture or a movie?

Cheers


__________________________________________________
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
Pictures: Me my bike and I
    

3Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:22 am

Holister

avatar
Life time member
Life time member
When you open a new post text box you'll see 2 picture icons on the left of the fifth group of icons. 'Host an image' and 'Insert an image'.... sounds like you did a good job of your cafe.... you should be able to work it out. If not there's a 'sticky' at the top of the General Discussion forum.

Try advancing the timing by about 4º


__________________________________________________
1988 K100RT     VIN No.  0094680
1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
     Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

4Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:25 am

duck

avatar
Life time member
Life time member
What did you change on the intake?

How and why did you adjust the mass airflow sensor?


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

5Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:34 am

tyetye

avatar
active member
active member
INTAKE.
 ive removed the mass air flow from the airbox and fitted it straight onto what i call the plenom chamber, make an adaptor to take a K&N fitter. the mass air flow meter was adjusted to richen up the fuel at idle, before adjusting the plugs were coming out white.. to lean. now they are a grey/brown colour.

    

6Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:39 am

tyetye

avatar
active member
active member









    

7Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:42 am

tyetye

avatar
active member
active member









    

8Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:44 am

tyetye

avatar
active member
active member











    

9Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 4:59 am

Holister

avatar
Life time member
Life time member
Oh dear! Looks like it might've been an SE in its previous life....


__________________________________________________
1988 K100RT     VIN No.  0094680
1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
     Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

10Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 5:33 am

tyetye

avatar
active member
active member
What's an SE?????

    

11Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 5:53 am

duck

avatar
Life time member
Life time member
SE = Special Edition

Blue/White paint job, white wheels, white on crank and valve covers, painted white side bags and a few other upgraded odds and ends.

How did you adjust the MAF? By spark plug color?


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

12Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 6:21 am

tyetye

avatar
active member
active member
Best I could do was vlean new plugs. Run at idle for 10 mins. Pulled the plugs and checked. Then good clean adjust mass with the Alan key . Repeat.  .. Tolk along time to get the colour I wanted. My local garage won't put it on there gas Analyser in case it damage is it

    

13Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 6:32 am

duck

avatar
Life time member
Life time member
Damage what? Your bike or the analyzer?

Here's another method:
http://skylands.ibmwr.org/tom/tech/co-setting.html


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

14Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 7:09 am

tyetye

avatar
active member
active member
The analyer. 
Any way I thought the mass air flow adjuster only controls fuel mixture at idle. After that the flap is moved by air flow from opening the throttle. My problem is the mid range????

    

15Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 7:42 am

k-rider

avatar
Life time member
Life time member
tyetye wrote:The analyer. 
Any way I thought the mass air flow adjuster only controls fuel mixture at idle. After that the flap is moved by air flow from opening the throttle. My problem is the mid range????
it does ,the method DUCK linked to works really well , but as you say it only affects the idle mixture, the lack of power in the midrange is probably due to your modification of the intake path and almost completely removing the ehaust, this might be great at WOT , but i belive the engeniers at BMW did a great job choosing a looong intake path , this provides tourqe all the way from bottom to top end 


k- rider


16Back to top Go down    Re: k100 cafe racer running problem on Thu May 25, 2017 8:23 am

MartinW

avatar
Silver member
Silver member
A little known feature built into the brick. If you have the engine idle set at at least 1000Rpm press the green starter button if the mixture is correct the idle stays the same or increases just slightly. If the idle drops or increases significantly the mixture is wrong and needs to be adjusted. This method only works on 2V bricks not the 4V ones. A suggestion has also been made that you can use this feature as a boost, not so sure about that one. Rolling Eyes
Regards Martin.

    

17Back to top Go down    Re: k100 cafe racer running problem on Sat May 27, 2017 6:35 am

tyetye

avatar
active member
active member
It's been suggested that I advance the ignition timing by 4 degree.  . I know how the do this by timing the timing plate clockwise but is the any way of checking it? Ie timing light?

    

18Back to top Go down    Re: k100 cafe racer running problem on Sat May 27, 2017 7:28 am

duck

avatar
Life time member
Life time member
Yes, you can use a timing light on a K.  But the forks kind of get in the way. I've read of using a mirror but haven't tried that myself.


__________________________________________________
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
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

19Back to top Go down    Re: k100 cafe racer running problem on Sat May 27, 2017 9:40 am

Holister

avatar
Life time member
Life time member
tyetye wrote:It's been suggested that I advance the ignition timing by 4 degree.  . I know how the do this by timing the timing plate clockwise but is the any way of checking it? Ie timing light?
You can do it by hand. Its nowhere near as critical as timing a points ignition running off a cam. Take a look at this thread.  All the info you need is in post #5 and #7.


__________________________________________________
1988 K100RT     VIN No.  0094680
1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
     Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum