BMW K bikes (Bricks)


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1Back to top Go down    Hot Ride on Fri Feb 24, 2017 7:39 am

DaleRT

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Just recently went out to visit friends in Dubbo, good opportunity for a good ride [about 600km round trip]
Weather report was for mid 40's C. - went anyway. It did get to 43' C in the shade.
The trip meter stopped working, so when home pulled the instrument panel apart and noticed this -





Warped a bit, the speedo face did not warp as much, the mounting screws are more evenly spaced.
The only down side was i lost the glass out of the r/h mirrow pod after hitting a good size pot hole.
I think, with that heat trucks were just squeezing the tar out of any repaired holes.

Is there any point trying to repair this face - if so how ? I did have a spare that i have fitted, working good.



The heat did not effect the fuel system, it has only the insulation under the tank and the fuel tank was quite warm to the touch.
Had a great day out. sunny Dale

    

2Back to top Go down    Re: Hot Ride on Fri Feb 24, 2017 8:27 am

BobT

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We get the odd summers day in the mid 40's but never had anything melt like that on the K or the Ducatis.
Could there be something else causing some heat in there? A small electrical short perhaps.

    

3Back to top Go down    Re: Hot Ride on Fri Feb 24, 2017 10:10 am

Point-Seven-five

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My RT speedo was starting to buckle when I got it. Fortunately, is wasn't bad enough to interfere with the needle.

The black face under the "glass" acts as a solar collector and can get as hot as 25C or higher above ambient on a sunny day. The reflective white interior of the instrument cluster helps hold the heat in too.

I carry a cover, one of those lightweight silver nylon ones, and use it whenever I am going to park for more than an hour, mostly to protect the red paint from fading in the sun, but it also protects the instruments. If I don't use the cover, I will put my gloves or the microfiber wiper that I carry for my visor over the instruments.

Keep them covered when the bike is parked!


__________________________________________________
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
    

4Back to top Go down    Re: Hot Ride on Fri Feb 24, 2017 10:37 am

Point-Seven-five

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The problem with these parts is built-in stress from the molding process that made the parts. This stress relieves itself over time when the parts get hot by distorting the part. By annealing the part with gentle heat and cooling you should be able to get most of the distortion out of it.

As far as flattening the instrument face you can try this.

Put a cotton towel down on a flat surface that won't be damaged by heat.

Put the instrument dial on the towel face down and fold the towel over it. Put an iron on the towel over the part and set it on the lowest setting for for about 10 minutes. Shut it off and let it cool to room temperature before removing. This may or may not flatten the face. If not, repeat at the next highest setting. If your iron is very light it may take some extra weight on top of it to help it flatten the face.

Be careful and patient and you should be able to get it pretty flat. The key is to heat and cool slowly, this is what will relieve the internal stresses. You want to get it hot, but not hot enough to melt the plastic.


__________________________________________________
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
    

5Back to top Go down    Re: Hot Ride on Fri Feb 24, 2017 10:51 am

Crazy Frog

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I was thinking basically about the same process....
Put the plate on something flat conducting heat (maybe a ceramic tile) in a warm oven with a big flat weight on the top of it.
Let it "bake" until flat.
We should start a cooking show with all the "baking" problems related to high heat on the K100.


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

6Back to top Go down    Re: Hot Ride on Fri Feb 24, 2017 11:03 am

Point-Seven-five

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The key here is SLOW cooling. The problem in the first place is due to cooling the part too rapidly and unevenly in the mold when it was first made.


__________________________________________________
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
    

7Back to top Go down    Re: Hot Ride on Sun Feb 26, 2017 8:35 pm

Dai

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If that fails PM me and I'll send you one, FOC.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

8Back to top Go down    Re: Hot Ride on Mon Feb 27, 2017 3:25 am

charlie99

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what an offer dai ....good stuff mate


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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
    

9Back to top Go down    Re: Hot Ride on Mon Feb 27, 2017 4:53 am

Stan

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Dale, you should have pm me as I live in Dubbo...... and it has been bloody hot of late. Yes I have had the same thing happen to my 83 basic... tacho... the bike would rev at 2000rpm, even when it was switched off. The needle was stuck at 2000. Welcome to my world.


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1983 K100basic vin 0003960 colour red
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl
    

10Back to top Go down    Re: Hot Ride on Mon Feb 27, 2017 6:29 am

DaleRT

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Thanks for the reply's
Looks like i'm doing some home duties - Cooking / Ironing.
Dai, great gesture, i'll practice my skills first [when Kathy is out ]
Ainsjac, if i'm ever out that way again, i just might look you up - cooler months only.
Now, where is that apron ...

    

11Back to top Go down    Re: Hot Ride on Wed Mar 01, 2017 1:56 am

K75cster

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Aprons like this maybe


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

12Back to top Go down    Re: Hot Ride on Sun Mar 05, 2017 5:51 am

DaleRT

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Well, cooking over and its not over done. It is FLAT.
It took several attempts, mainly to get the appropriate temperature.
I did try the Iron, it was not getting hot enough or not heavy enough to make a good contact.
Using an Infrared Thermometer i had 2 cast iron pans heated to 90c, then removed from the heat.
Folded a cotton rag over the Tacho face and placed it between the bases of the 2 pans.
Only left it there for several seconds, did this a few times till it looked like it was sitting flat.
Each time i looked at it i unwrapped it to make sure the rag was not sticking to the face,
or starting to leave an imprint on the face.
Anyway, with it sitting flat i then put it between 2 wooden chopping blocks [they were handy].
I had a 7lb weight [door stop] also handy, so used this to keep it flat.
Left it there for hours to cool.
The face is flat, it fits and i am away. Thanks all, Cheers Dale.

    

13Back to top Go down    Re: Hot Ride on Sun Mar 05, 2017 12:52 pm

Point-Seven-five

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Nicely done! cheers

Perhaps the moderators could move your post to the reference library to help those in the future who will encounter the warped dial face syndrome.


__________________________________________________
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
    

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