BMW K bikes (Bricks)

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Life time member
Life time member
Hello all 
Your wisdom is needed 
I wash the the bike and now she seems to be running on two cylinders only 

It wont idle 
And when riding it seems to fire when it wants and then stop again 
It like a boost button and put about 500 to a 1000 extra revs on in a split second then die again 

I went a 5km hoping the heat would sort it out but it was bloody hard work riding it and working the throtle to keep it going 
And a bit wild in a corner when it kicked back in 

Where should i start looking 
Is this lead coil or hal sensors ?


Rick G

Rick G
I doubt very much the hall sensors would be the problem. Coils and leads would be the first place to look and check for water in the multi pin plug on the ECU

"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


Life time member
Life time member
How good are the seals on your gas cap?  Could be water in the gas.

Unless they have lots of dirt on them I generally don't wash my bikes anymore, just go over them with cleaner wax.

Occasionally I take the wheels off and wash them though.

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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT


Life time member
Life time member
She running great again

Checked the big brain under the seat and it was dry 
Took the cover off the coil pack and the bottom of the pack was a little wet
Took the spark plug cover off the leads seem dry hard to tell with the heat



Life time member
Life time member
If it happens again, spray the coils where the plug wires connect with WD40.  This will push out the water and quickly dry the connections.  This is what WD40 was designed to do, but, ironically, it's the one thing that almost nobody uses it for.

You might want to check the plug wires and the rubber caps at the coil connection for cracks and splits.  Normally, unless you go crazy with a pressure washer(should never be used on a bike) the electrical stuff should not be adversely affected by water when you wash the bike or ride in heavy rain.

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

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