BMW K bikes (Bricks)

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Andy S

Andy S
active member
active member
Hi all,

Took my bike out for a ride after it sat for a number of weeks.
>>Cold/hot starts great and right up.
>>Idles perfectly at 800-900
>>Revs on the stand perfectly and smoothly to about 4-5ks.

>>Rides fine for about 15-20 mins.....then starts to stumble and cough badly, surging in between spurts of power and nothingness!

>>Let it sit for a few mines....everythings fine...then repeats the above.

Please guide with elements i should check

    

K75cster

K75cster
Life time member
Life time member
Those symptoms sound like a clogging filter, perhaps replacing the fuel filter will resolve it.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

Andy S

Andy S
active member
active member
i checked the fuel filter, looks absolutely free flowing if blow into

can it also be bad fuel pump?

    

Inge K.

Inge K.
VIP
VIP
Sounds like a hall sensor problem to me, but could also be a bad coil.


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

Two Wheels Better

Two Wheels Better
Moderator
Moderator
An ignition coil will often be the cause of what you're describing after it has warmed up a bit, and also if it is humid or wet when you're riding... but so can the hall effect sensor as stated prior. Very lightly mist some water from a garden mister round the coil area (behind plastic cover at the back end of cylinder head) to see if it 'acts up'. As a coil warms it can, if old or damaged, open up, causing an electrical short.

If not this then remove five allen head screws of the T-shaped cover at front of engine, inset of the timing chain cover, taking care not to disturb the cork gasket - it is fragile if pulled apart quickly. There is the hall sensor. Check for chafed wires, etc. But what can one do but replace that? it is not an inexpensive experiment as it operates on FM.
study


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1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '13 R1200RT-P, '95 R100 Mystic & '77 R75/7.

    

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
You can swap the coils to check if its a coil issue.....or substitute a known good coil for one coil, take a run, then swap over the second coil. A very easy test and probably try that before going at the Hall sensor.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 98,780 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 32,600 miles
    

Andy S

Andy S
active member
active member
my oh my!

and i thought running an injectior system cleans thru the tank would help Sad(

    

Andy S

Andy S
active member
active member
weekend update

1. check the hall sensor wiring, nothing pinched or misalligned.
2. swapped coils and checked wiring around them.

no change.

what now?

    

RicK G

RicK G
VIP
VIP
Although it isn't classic case of hall sensor it sure is starting to sound like it.
You can get the sensors separately and attach them to the existing plate but not sure how you would go in Pakistan getting them.
This is the source for them in Australia http://www.jaycar.com.au/productView.asp?ID=ZD1900
And USA http://www.bbautomacao.com/home_hall_effect_sensor_cyhme56.html


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

charlie99

charlie99
VIP
VIP
could well be the fuel pump ....many of us have found the connector that joins the harness to the tank connection to go open circuit

the socket part over time opens up and doesn't close on the pins for good conduction ....this might affect the pump for sure  (a little recrimpling usually restores the connector) ....after a good clean up .

look up deoxit (good for all electrical connections )

I  also would open up under the tank and locate the connectors for the hall sensors ....because they dont get disturbed very often,
 there is a high likelihood that they also could be corroded ....could the heat soak over time and running be affecting this ? I found mine corroded like crazy and nearly to the stage of powder in the connector ...not good for reliability

many think that mechanical oils and fluids is all there is to maintenance ....but that's not the only answer on a efi type system ....electrolysis , and general corrosion of electrical connectors by far outweighs the mechanical problems we find in here on "new to me " running issues ....atmosphere is the key .

good luck !!


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OEng stumbles hard on riding..temporarily....idle/revs great. Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

Andy S

Andy S
active member
active member
Enuff said Smile
Thankyou gentlemen

Eng stumbles hard on riding..temporarily....idle/revs great. Img_2710

    

RicK G

RicK G
VIP
VIP
Good you are back on the road Andy. Next time can you give us some easier questions, not many of us got them right. Very Happy


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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