BMW K bikes (Bricks)

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Omegaman

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I recently got a 1985 K-100....and just joined this great forum... I love the bike. On good days, it purrs and performs like a thoroughbred. Great. On bad days, it back fires and lags off the stop light and generally seems wonky in the way the engine responds to throttle (too much fuel choking? Too little? ) also get the overheat temp light... But the coolant level fine. Weird. And finally, sometimes I get white smoke come out exhaust when I start it up. Again, sometimes not. Haven't serviced it yet-no time- . Maybe plugs change, oil and cool flush. Check cool fan. These are my lovely dilemmas. Cheers all!
Omegaman

    

92KK 84WW Olaf

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Most important to check the cooling fan. They do go wrong, seize or won't turn at all. If the temp light comes on check if fan comes on. I don't know which comes on first but I think it should be the fan. If it is not coming on you can check by running a separate live supply and see if it comes on. If it doesn't work then its probably kaput. The fan is a known weakness.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500miles
    

Comberjohn

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Agree with Olaf on checking the fan. The fan should kick in before the light comes on. Let it tickover on the centrestand and the fan should come on after 10-15 minutes.
It's not unheard of for them to seize up. Thirty year old electrical connections can cause problems, too.
Regarding the smoke. Are you sure its white?
Common issue with early K's is that if you switch off too quickly after you pull up, you can get oil being burnt through the exhaust. Especially if you put it on the sidestand immediately.
Easily cured!
When you stop,let the engine tickover for 8-10 seconds before you switch off. You can then park it on either stand and no more smoke when you start again.
Later K's, '86 onwards, had piston ring mods that prevented this from happening. Wouldn't worry about it though.


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Life is not a rehearsal.
2010 VFR 1200F DCT
2010 R1200GS(gone)
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

Omegaman

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Thanks guys! Will give it a go and let you know.
Cheers and great riding.

    

RicK G

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The smoke issue is a well known one and caused by the oil getting past the rings when parked on the side stand. The cylinders face slightly down and oil draining from above collects in the bores and gets past the rings into the combustion chamber and exhaust. john said the post 87 bikes had a correction mod but my 93 K1100 still does it.
The fan should come on at 103C and the light at 111C so check the fan as suggested.
Just getting hot should not cause bad running in itself, check the electrical connections under the tank and treat with a contact cleaner like Deoxit. The hall sensors that control base ignition timing are prone to failure with heat but usually it is a very definite go/no go situation with them but would pay to check by heating with a hair dryer when the engine is cold and seeing if it has an effect.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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