BMW K bikes (Bricks)

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foilopog

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Hi
I'm new to dismantling K100 engines but am having a very good attempt at getting an abused (not by me) K100RT restored and back on the road. I've taken most of it apart and now have some questions. Many more will probably follow!

Firstly, throttle bodies. I've taken pictures (but can't work out how to attach them here - any ideas?)

Looking at the bodies from the top there is some black discolouration inside in the first 2 chambers. From the underside, the first two are really gunked up with dirt and black oily stuff. Is this normal?
Should I worry?
Do I need to take strip the engine further or should I just clean them up, check valve clearances and rebuild?

I sure that the rubber parts on the bodies are knackered so will replace when I replace other worn items on rebuild.

Any advice greatly appreciated.
Cheers...
Foilopog

    

rosskko

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Hey,

others who know stuff will tell you about the TBs

I can search the forum so here is my contribution.

http://www.k100-forum.com/t998-posting-pictures-and-movies#5126


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1986 K100RT VIN 0093801K100RT with summer fairing for a northern visitor

Basic/2 6308802K100CJ05/1988

K1100RS 0194321
    

3Back to top Go down    Blackened throttle bodies on Wed Dec 04, 2013 5:23 am

foilopog

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Many thanks for replies. Here's a picture of the throttle bodies I mentioned...

1456615_10151751003692181_1037104210_n.jpg

1460035_10151751003702181_1400716200_n.jpg

Would love to know if normal - all the rubbers etc were original and in a very poor state.

Cheers...

Foilopog

    

RicK G

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Make sure the valve clearances are correct that looks to me as if the riding valves have been sending some combustion back to the throttle bodies.


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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
    

charlie99

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looks as though there has been a bit of blowback happening ..possibly from an over tight inlet valve
or the valve is actually not seating correctly now with a bit of wear between seat and valve ?.

I would pull the cam cover on the head and do a little measuring before anything else

I have seen similar on 3 sets of throttle bodies I have pulled apart recently also (but more usually at the other end of the set ...where oil vapour is returned through the intake tract from the oil breather introduction to the plenum )
I guess oil vapour sticks to the bore a bit more down that end and deposits more gunk durring the cycle

the cams have a good bit of overlap and a good bit of early opening+ the ignition fires on the alternate stroke in any case ....which could also mean that the fuel in the inlet path (from the 4 times a cycle injection ) could be partially igniting with the valve not sealing properly ?

or is it just not evacuating all on the exhaust stroke ( ie restriction down the exhaust pipe or weak-misfiring ignition ...)

just somehypothetical guess to explain the phenomena


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

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