BMW K bikes (Bricks)

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1Back to top Go down    repainting the radiator on Wed Apr 04, 2018 2:25 pm

mister_anger

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after 35 years the black paint of the K100 radiator is not so black anymore.
I've been looking repainting the radiator but it seems that the oudside pieces of the radiator are not made from aluminium.
Anyone ever tried repainting the radiator?

thx,M

    

2Back to top Go down    Re: repainting the radiator on Wed Apr 04, 2018 3:50 pm

Point-Seven-five

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I haven't analyzed the metal in the radiator, but there are only two metals that I know of being used. Aluminum and brass. I think that brass radiators typically had a black oxide coating that was created by a chemical process. Not sure what was done on aluminum, maybe anodizing.

Paint is not what I would use. Paint makes an insulation layer that will reduce the cooling capacity of the radiator. On bricks, cooling is not excessive and anything that would reduce it should be avoided. Anyone restoring a brick really shouldn't use paint and just leave the finish alone. On the other hand, if you are doing a custom build, you are probably not going to be doing the kind of riding that would stress the cooling system, so in that case it would probably be okay to paint it.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down    Re: repainting the radiator on Wed Apr 04, 2018 8:22 pm

RicK G

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The radiator is usually hidden behind the fairing or cowl so if you are repainting for looks then use just a bare minimum of black satin and if it is to remain hidden then leave it alone.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

4Back to top Go down    Re: repainting the radiator on Thu Apr 05, 2018 3:38 am

mister_anger

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I am doing a full rebuild and the result will be a naked bike "cafe racer". So the radiator will be visible and it would be nice to refresh it.
I use special radiator paint. This paint does not build up a thick layer and keeps airflow. Used it before and it works good.
The side walls (collectors) of the radiator are still in good shape and can be cleaned and polished. Only the metal section (middle, top and bottom) needs to be painted.

    

5Back to top Go down    Re: repainting the radiator on Thu Apr 05, 2018 10:51 am

Point-Seven-five

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From what I've seen, most cafe bikes are only used for quick trips around town and don't normally experience the conditions that stress cooling systems, so painting shouldn't be a problem.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down    Re: repainting the radiator on Thu Apr 05, 2018 11:59 am

Inge K.

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@mister_anger wrote: The side walls (collectors) of the radiator are still in good shape and can be cleaned and polished.

FYI. it's made of plastic.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

7Back to top Go down    Re: repainting the radiator on Thu Apr 05, 2018 12:31 pm

mister_anger

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that is what I thought.
But my problems have been solved because today I found a NOS radiator for 180$. This is a killer find.
And it includes the thermostat ;-)
And the guy that sells it lives about 20km from my home. So this is really nice.

    

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