BMW K bikes (Bricks)


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Jacod

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So a while ago I put one of those cheap ebay speedometers on my K100. I've done a few 100kms since then and is has been working well. However, I still hadn't bothered / managed to get the neutral light, or the GPI to work until now.

I wanted to get the GPI, Neutral light, and no clutch start to work but I didnt want to mess around adding another circuit. I did consider doing the multiple relay trick to get the no clutch start to work, but I really wanted to get the GPI to work too.

I'm lucky enough to have access to a 3D printer and I'd been meaning to grease the driveshaft splines and swing arm bearings for some time. So I decided to pull the back end off and redesign the TGPI switch while I was at it. My design is much the same as the original, however, I designed it to have 6 terminals; one for each gear (inc Neutral) and a centre terminal. Rather than the 3 terminal multiple combo thing the original had.

I 3D printed the new rotational switch with 6 terminals carefully measured and spaced. I 3D printed a new cap for it too, as the old one was stuffed and fell to pieces in my hand when I was taking it off. I then cut some small pieces of copper to size and soldered a wire to the back of each one. I drilled holes for each wire to go through up into the cap. Glued the cap on and wires in place before assembling it all back together and testing it out.


After refitting the modded switch and ensuring it worked, I wired it up to a eight pin quick connector for easy removal.






To get the neutral start to work I just wired up a small relay as pictured below.

I'm pretty stoked with the result I tested it all and it works amazingly. Better than I had hoped.
I guess every one has their own way of doing things.
Now everything on my ebay speedo works, and other than the bulb monitor and clock I don't think I'm really missing any of the original functionality.


    

charlie99

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great work !


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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
    

Dai

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Brilliant!! Very Happy


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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)
    

Motorbike Mike

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A modified R1100 neutral switch is the easiest way to go. It took 1/2 an hour!

    

duck

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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Jacod

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Not quite the same. My solution gave me both neutral start and gear position indications.

    

7Back to top Go down    @ Jacod on Sun Sep 10, 2017 3:36 pm

KevinGuy

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I like your solution best. I need to grease my spline and from what I've read here expect to find the original switch in bad shape anyway so solving the decoding problem at the source makes sense.

How is it holding up under use? Do you have schematics to use with a 3D printer, my buddy has access to one.

Or, better yet, any chance of making one for sale?

    

KevinGuy

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@Motorbike Mike wrote:A modified R1100 neutral switch is the easiest way to go. It took 1/2 an hour
How does this mod work? Is it written up somewhere? Would this give gear indication as well as neutral start?

    

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