BMW K bikes (Bricks)

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1Back to top Go down   BMW K75S  Empty BMW K75S on Mon Jun 03, 2019 5:24 pm

Superfast

Superfast
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active member
Hi guys

Do you know of a speedo/tacho that will work on a BMW k75S..?? I currently have a cheap Chinese one fitted but it's rubbish.. Crying or Very sad

Thanks

    

2Back to top Go down   BMW K75S  Empty Re: BMW K75S on Mon Jun 03, 2019 5:36 pm

chris846

chris846
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Which one do you have fitted?

This one is cheap, chinese, and I suppose rubbish when it comes to the supplied instructions and its out-of-the-box ability to hook up to a K for example, but it can be made to work just fine:

BMW K75S  36210


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The Longest Lunch
    

3Back to top Go down   BMW K75S  Empty Re: BMW K75S on Mon Jun 03, 2019 5:40 pm

Superfast

Superfast
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active member
Yeah that's the one..?? The taco doesn't work..?? The neutral light comes on in 3rd & 4th..?? & the speedo keeps going off & on..??

    

4Back to top Go down   BMW K75S  Empty Re: BMW K75S on Mon Jun 03, 2019 5:56 pm

Superfast

Superfast
active member
active member
Hi Chris846

Could you give me any info on how to get it to work correctly.

Thanks

    

5Back to top Go down   BMW K75S  Empty Re: BMW K75S on Mon Jun 03, 2019 8:31 pm

Laitch

Laitch
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@Superfast wrote:Could you give me any info on how to get it to work correctly.
While you're waiting, read this thread all the way to its end. It's packed with relevant information, some of which might be helpful in your situation. Very Happy


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1995 K75T 73,000 miles
BMW K75S  Usa-lo10
    

6Back to top Go down   BMW K75S  Empty Re: BMW K75S on Tue Jun 04, 2019 1:47 am

Superfast

Superfast
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active member
Hi Laitch 

Thanks  Very Happy

    

7Back to top Go down   BMW K75S  Empty Re: BMW K75S on Wed Jun 05, 2019 5:42 pm

chris846

chris846
Life time member
Life time member
Start with the tacho eh? How have you connected the tacho signal input wire to the bike?

The ebay tacho doesn't seem to have the degree of filtering on the input that more expensive units have. This means that it is susceptible to additional electrical noise that might be on the wire that you hook it up to - the wire from the ignition control unit to the coil primary for example. It doesn't take much of a circuit to filter this out, if you're up for it. 

The other (much more sensible) way is to send a bit of cash in the way of one of our brainy forum members who has designed and built bespoke circuit boards, just to do this sort of thing, and decode the gear position indicator too!

Edit: the advantage with the bespoke board is, I guess, that it conditions all the K100 signals etc. so's you can use pretty much any aftermarket tacho/multifunction display etc. The hard work is all done for you. Search for 'TGPI Board' on this, fantastic forum.

Edit2: If you want to do it the painful, dumbass diy way, post 75 on the 'K75 Madass' thread will give you an idea of the trauma involved.


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