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


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & the 2nd '98 K1200RS
    

92KK 84WW Olaf

avatar
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 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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 49,200 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

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
admin
admin
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 1999 K1100 LT with a Big Block 1200
    

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%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

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
admin
admin
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 1999 K1100 LT with a Big Block 1200
    

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