BMW K bikes (Bricks)

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active member
active member
My 1989 K100RS will not start or run. Found a damaged wiring harness connector between Hall Effects sensor and the ignition control module. The  Hall Effects side of the connector looked as if it had gotten heated and the connected itself crumbled upon inspection on hall effects side.

It seems that the  2 & 3 spark plugs are only getting minimum spark if any and the ground to the fuel injection relay seems to drop out of the circuit once you release start button. The engines attempts to start as long as the start button is activated. Is it such that maybe the 2 & 3 hall effects sensor is now defective?  I am also assuming that the wiring harness on the hall effects side will have to be repaired before the bike will start and run. I have manually plugged each of the 5 wires from the hall efforts sensor into the ignition control module hoping that I could at least start the bike, but no start. That is some non shielding going on to the hall effects due to the damaged connector. Any suggesting or comments for resolution will be greatly appreciated.

Prior to my non start issue my bike was running badly.  

Bill Hutchens
San Antonio, Tx



Life time member
Life time member
Could be the sensors are toast, they are known to fail with age and heat.  Can't say what to do with the connector .

As far as the fuel pump relay, I seem to recall that once the starter button is released, it is the signal from the Hall Sensors that keeps it engaged, so if you are losing the signal from the sensors, it makes sense that the pump won't run when you release the starter button.

Present: 1991 K100RS "Moby Brick Too"
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175


sounds like the hall effect wiring has been damaged and shorting to the chassis , which could be a possible reason for the chared connector- wiring

the hall effects drive the ignition module which in turn drives the fuel pump relay  etc

replacement he module and cabling , but do measurements before connecting the replacement stuff to the electrics

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 )

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