BMW K bikes (Bricks)

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1Back to top Go down   1988 K100 hesitation Empty 1988 K100 hesitation Sun Apr 11, 2021 3:22 pm

ush1000

ush1000
active member
active member
Hi

I absolutely love my bike but it has developed a little niggle which seems to be getting worse. 

After a blat around the country roads doing normal speeds, 50 60 mph, when I slow to pootle through a village at 30 mph the bike occasional cuts out/hesitates for maybe 1/2 second then all ok again. 

It used to do it once in a blue moon but it is getting more regular, I think the bike is warning me to investigate. It feels like an electrical problem rather than mechanical. Does this fault ring any bells with you guys? ECU TPS?

Thanks for reading

    

2Back to top Go down   1988 K100 hesitation Empty Re: 1988 K100 hesitation Sun Apr 11, 2021 4:46 pm

Laitch

Laitch
Life time member
Life time member
If you haven't changed the fuel filter, it's time to do it.

Intermittent, brief stalls like this are hell to chase.
You'd most likely be better off by just cleaning your earth connections and electrical connections using DeoxIT D5, starting with the main ground connection under the tank, the four-pin connection under the tank that supplies the fuel pump and fuel level sender, ignition control plug under the tank, the battery earth connection on the transmission, your fuel injection control plug under the seat.

DeoxIT can be obtained on line or often at musical instrument stores that sell electrical components. It's an effective product for cleaning and protecting connectors.


__________________________________________________
1995 K75 81,000 miles
1988 K100 hesitation Usa-lo10
    

3Back to top Go down   1988 K100 hesitation Empty Re: 1988 K100 hesitation Sun Apr 11, 2021 4:47 pm

Laitch

Laitch
Life time member
Life time member
1988 K100 hesitation 652573



Last edited by Laitch on Mon Apr 12, 2021 6:16 pm; edited 1 time in total


__________________________________________________
1995 K75 81,000 miles
1988 K100 hesitation Usa-lo10
    

4Back to top Go down   1988 K100 hesitation Empty Re: 1988 K100 hesitation Sun Apr 11, 2021 6:24 pm

robmack

robmack
Life time member
Life time member
I had this problem last season.  I had hesitation as well as engine stalling if I closed the throttle for engine braking when approaching a red light for example.  I don't know if you are experiencing the second symptom, however I changed out the Z-tube that connects the air accumulator to the crankcase breather and it solved my problem.  The old Z-tube looked in fine shape visually and I was certain all the clamps were snug but still, changing the part got rid of the problems for me.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

5Back to top Go down   1988 K100 hesitation Empty Re: 1988 K100 hesitation Sun Apr 11, 2021 6:51 pm

moriarti

moriarti
Life time member
Life time member
I had same or similar problem loads of suggestions nothing worked until Crazy Frog
Suggested ICU ignition control unit fitted at front of frame under the tank. Replaced same with S/H unit problem solved. Very Happy Very Happy


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

6Back to top Go down   1988 K100 hesitation Empty Re: 1988 K100 hesitation Sun Apr 11, 2021 8:02 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
How is your battery? My 1988 K100 alternator stops charging at about 1500 rpm, and the battery takes over. If the battery or the electrical connections are not up to snuff, it's possible for the system voltage to momentarily drop enough to create problems for the ECU or the injectors.

I had another K100RS16V that had a voltage regulator problem that made the system voltage drop to about 11.8 when coming to a stop after a high speed run while the regulator slowly increased the alternator output at the lower rpm. It didn't help that the battery was also a bit long in the tooth. That bike had a habit of dying at the end of expressway off ramps until I replaced the regulator.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

7Back to top Go down   1988 K100 hesitation Empty Re: 1988 K100 hesitation Mon Apr 12, 2021 3:01 pm

Matthew-Brisbane

Matthew-Brisbane
Life time member
Life time member
How good are your coil and leads ?


__________________________________________________
1986 K100 RS Motorsport
#### K100 RS Project 
2011 R1200 GS
    

8Back to top Go down   1988 K100 hesitation Empty Re: 1988 K100 hesitation Mon Apr 12, 2021 6:06 pm

ush1000

ush1000
active member
active member
Awesome guys thanks, loads of stuff for me to investigate and get stuck into. I will update the thread if I find a cure.

Thanks again

    

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