BMW K bikes (Bricks)

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SniperX

SniperX
Silver member
Silver member
Greetings,

I need the circuit board (functioning of course) that has the LCD gear indicator in it for the 85 K100RT. My tach works, but the gear indicator is all jacked up and is inop. Please PM me here or email me at kevin0232@gmail.com

THANKS!

Kev

    

RicK G

RicK G
VIP
VIP
It may not be the display, the sender on the rear of the gearbox behind the swing arm could well be the problem. They get water in them and display all sorts of gear positions. They can be taken apart but care is needed when the little springs hide under the bench. You need to cut the crumbling rubbery sheath on them and then they come apart. look carefully there are small clips that hold the 2 parts together.


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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
    

Dai

Dai
Life time member
Life time member
I agree with RickG. I've cleaned three GPIs now; two just needed the contacts polishing but the third was corroded fubar. On reassembly I've used self-amalgamating tape (sometimes called self-vulcansing tape) to form a new waterproof cover.


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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)
    

SniperX

SniperX
Silver member
Silver member
Mine displays nothing. Where exactly is it? (the pick up mech)Which side? Although, I think my circuit board needs to be replaced as I live in the desert and it has been beaten up by the sun since 1985. Looks like the LCD itself is sort of :Sunburned".


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1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

blaKey

blaKey
Life time member
Life time member
Gear indicator board for 1985 K100RT instruments Gearbox-switch

It's the circular thing with the blue gunk on it. The blue stuff is probably silicone to try and seal it from the elements, but that's where you'll find it.


Gear indicator board for 1985 K100RT instruments IMG_0100
(Photo courtesy of Crazy Frog...our esteemed Leader)

This is the guts of it.



Last edited by blaKey on Sun Oct 25, 2015 9:28 pm; edited 1 time in total


__________________________________________________
Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

Dai

Dai
Life time member
Life time member
Can someone repost the GPI switching pinouts please? The link to Duck's site is 404'd. I'm thinking that a test with a multimeter would be a good idea before pulling the swingarm.


__________________________________________________
'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)
    

Inge K.

Inge K.
VIP
VIP


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

Dai

Dai
Life time member
Life time member
Thanks Inge - that's exactly the post I was thinking about.


__________________________________________________
'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)
    

Born Again Eccentric

Born Again Eccentric
Life time member
Life time member
and here's one I prepared earlier...

Gear indicator board for 1985 K100RT instruments Gpi_ex10

GPI switch bolted onto rear of gearbox - 2x M4 bolts (yes these have sheared off in my donor bike pic and the black is probably 89k miles and 24 years of road dirt). Electrical plug and socket (connects GPI switch to Instrument cluster) - found on RHS of bike near coolant expansion tank.

It's easiest to test LCD in instrument cluster first - insert wires into female socket (I soldered short lengths of wire to 4 panel pins which were then inserted in the sockets - made the test much easier) and, with ignition on, connect wires in turn (BC/ABC/AC/C/AB/B) to earth (E) to prove LCD read correctly and neutral light functions when it should. 

GPI switch can be tested for continuity (each pin to earth) - not always as conclusive as testing the LCD.

  • Pin C: should have continuity in 1st, Neutral, 2nd and 3rd...but not 4th or 5th
  • Pin B: should have continuity in 1st, Neutral, 4th and 5th...but not 2nd or 3rd
  • Pin A: should have continuity in Neutral, 2nd and 4th...but not 1st, 3rd or 5th.


If reading erratically or incorrectly, then its a swing arm off job to access the GPI switch (2 - 4 hour job). 

I had to do Gretel's GPI switch again last weekend (having previously been in to clean up the contacts) - ordered a new GPI switch (second hand) as a come in handy. Turned out the problem was not the switch, but it's mounting. At some point in her past, the M4 hex head mounting bolts had been replaced with M5 allen bolts. To get the M5 bolts to fit through the GPI switch, the brass bushes  that locate the GPI switch precisely in position had been removed - as a result, there was a small amount of angular movement possible between the plastic of the switch and the M5 bolts - this tiny movement was enough for the GPI switch to be secured a couple of degrees off where it should be - enough to give a blank indication in 1st, 1 when in Neutral and blank in 5th etc. Of course, with the M5 bolt modification - I couldn't fit the new GPI switch without further modification. I ended up cutting a M5 thread in the new bushes and screwing them onto the allen bolts before sliding them back into the GPI switch and bolting to the bike. Bit of a pain to do, but job done and all working again!


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Gear indicator board for 1985 K100RT instruments Uk-log10 Gear indicator board for 1985 K100RT instruments Sco-lo15Gear indicator board for 1985 K100RT instruments Eu-log10
                              Paul  Gear indicator board for 1985 K100RT instruments 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

blaKey

blaKey
Life time member
Life time member
Nice work!


__________________________________________________
Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

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