BMW K bikes (Bricks)

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jbt

jbt
Gold member
Gold member
A few months ago, i bought a used and incomplete K100RS.
I was only interested in the papers and frame, to use it on my sidecar, which had no homologation.
So I wasn't in a hurry to collect this bike, pretty far from home, so a friend had stocked it in its barn.
It eventually was delivered yesterday by a buyer who came to buy my Royal Enfield and picked it up at my friend's.
The bike was abandoned for 10 or 20 years.

The first thing I noticed was the blurp from the Jetronic controller:



It was almost full of water indeed:




k100 Jetronic Watercooled. Should I worry? Img_2384
But who cares? It was a K75 controller. Shocked

So I noticed that the injectors were missing and that only the 4th cylinder had a cloth plugged in the injector hole. The others were open to the sky...



k100 Jetronic Watercooled. Should I worry? Img_2383
And the rusty juice sipping from a sparkling plug was not a very good presage.

So, time to use the endoscopic cam my brother offered my as present for my 50th birthday with this comment "At your age now, it may be used not only in your garage".

First the valves:
k100 Jetronic Watercooled. Should I worry? Img_2385


k100 Jetronic Watercooled. Should I worry? Img_2386
k100 Jetronic Watercooled. Should I worry? Img_2387
k100 Jetronic Watercooled. Should I worry? Img_2388

Then the combustion chambers:
k100 Jetronic Watercooled. Should I worry? Img_2393
A River Runs Through It. Probably an ex-Robert Redford's bike.




k100 Jetronic Watercooled. Should I worry? Img_2392


Should I go ahead?
No.
I won't even flush the engine. Just a new battery, il will probably start.


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

Woodie

Woodie
Life time member
Life time member
Definitely give it a good drain and maybe blow it out with some compressed air before you fire it up jbt.  Just to play it safe of course. lol!


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k100 Jetronic Watercooled. Should I worry? Logo2111
1985 K100RT  52667
1990 K75RT 6018570 (project)

"Keep your stick on the ice.  We're all in this together."  Red Green
    

Dai

Dai
Life time member
Life time member
jbt wrote:Should I go ahead?
No.
I won't even flush the engine. Just a new battery, il will probably start.
k100 Jetronic Watercooled. Should I worry? 44271 It probably will. The FICU should be okay after a careful clean.


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1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Those reddish brown stains are probably corrosion and quite possibly conductive enough to mess up the operation of the unit.

I would give that part of the board a bit of a clean with lemon juice and a toothbrush(I always use the wife's toothbrush).  Follow it with a good clean water rinse, blow or shake off the excess and then immediately do a rinse in 90% Isopropyl rubbing alcohol to remove any remaining water.  Let it air dry for an hour or so and give it a try. 

If it worked before the water got to it and the water didn't freeze, there's a good chance it will work again.


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Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
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
    

jbt

jbt
Gold member
Gold member
I think I won't even try to start it, as I wrote, I bought this bike only for its frame and registration documents. 
As water stayed in the barrels for years, there's probably corrosion into the barrels. So I'll salvage the engine, but will save some elements before, in particular the head to be ported and machined to receive the Luftmeister cams & valves.


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

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