BMW K bikes (Bricks)

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1Back to top Go down   Gear indicator Empty Gear indicator Mon Jun 03, 2019 8:42 pm

Davep

Davep
Silver member
Silver member
OK, here's a weird one!

Riding along today, knock it up in to 4th, looked down and the gear indicator said 5, OK thinks I, drops it down one and it goes to 3! After a bit of flicking up and down I realise that the bike is going through the gears fine, 3rd to 4th to 5th and back down, however the gear indicator is not playing, when in 4th it still says 5 when I knock it up to 5th it still says 5 and then back down to 4th and it still says 5, down to 3rd and it says 3! 

I know that sounds more confusing than it needs to be and in the grand scheme of things doesn't make much difference as I ride in the gear the bike needs but it's just bothering me now. Everything else works fine, the ride is smooth and the gear selection is easy. I'm not a lover of electrics in any shape or form but I absolutely hate motorbike electrics, they just confuse the hell out of me!

So, if anyone out there has ever come across this before I would love to know the how's and why's and if it's an (easy) fix.

Cheers all

Dave


__________________________________________________
Gear indicator Eu-log10 BMW K100RS 1983 (Main ride)
                      Suzuki GSX 750 ET 1979 (Needs work)
                      Kawasaki Zephyr 750 1992 (Needs hiding)
    

2Back to top Go down   Gear indicator Empty Gear Indicator Mon Jun 03, 2019 11:28 pm

Pearlsilver

Pearlsilver
active member
active member
Davep 

The chances are is the indicator switch that is playing up, mine wasn't working in some of the gears, so replaced the indicator switch that is at the back of the gearbox, bit awkward to get to.

If I remember rightly you may have to remove the rear swing arm. 


Hope this helps.

https://bimmercat.com/bmw/EN/search/selectCar/89V1/ohne/BMW+K+100+RS+%280523%2C0533%29/ECE/23_1154


__________________________________________________
Nwoody
Barry Island.
    

3Back to top Go down   Gear indicator Empty Re: Gear indicator Mon Jun 03, 2019 11:43 pm

MartinW

MartinW
Life time member
Life time member
The switch is subjected to water and road crap. Sometimes they will resurrect themselves when they dry out. You can remove them and disassemble and clean. It is worthwhile waterproofing them when refitting with silicone or in my case Plasti Dip.
Regards Martin.


__________________________________________________
K75s Hybrid
    

4Back to top Go down   Gear indicator Empty Re: Gear indicator Tue Jun 04, 2019 12:44 am

duck

duck
Life time member
Life time member
And sometimes that will crumble to pieces when you attempt to remove them. Laughing


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

5Back to top Go down   Gear indicator Empty Re: Gear indicator Tue Jun 04, 2019 2:28 am

Woodie

Woodie
Life time member
Life time member
@duck wrote:And sometimes that will crumble to pieces when you attempt to remove them. Laughing
Yup, lost one and successfully rebuilt a second one with silicone


__________________________________________________
Gear indicator Logo2111
1985 K100RT  52667
1990 K75RT 6018570 (project)

"Keep your stick on the ice.  We're all in this together."  Red Green
    

6Back to top Go down   Gear indicator Empty Re: Gear indicator Tue Jun 04, 2019 3:29 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The switch is fairly easy to service...once you have it off the bike.  You need to remove the swing arm and the battery mount to get it off the bike.  That can take a couple hours depending on how experienced you are.

The insides are full of tiny springs and bits you need to be careful not to lose.  As long as you are careful and take your time you won't have a problem.  I work on my switches in a shallow plastic food storage container about 10"x10".  A very fine point tweezers from a hobby shop makes handling the springs and contact pins easier.  Deoxit and an old toothbrush work well to clean the parts.

The main problem I have seen with the two switches I've had to service is the potting compound used to seal off the wires on top of the switch.  I looks like it was some kind of wax that over the years has hardened and cracked, allowing water to work it's way into the working bits and screw up the operation. 

I carefully remove every bit of that stuff and clean the part really well with lots of 91% rubbing alcohol applied with small brushes and Q-tips.  After it dries overnight I mix up some slow setting epoxy and cover all the wires and connections on the top with it.  I let the epoxy cure overnight before reassembling the switch.  The joint where the switch splits is sealed with a couple wraps of self-amalgamating tape.

Reinstall the switch with Allen head screws.  They are much easier to remove and reinstall when the body of the switch is wrapped with a bit of tape.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

7Back to top Go down   Gear indicator Empty Re: Gear indicator Tue Jun 04, 2019 3:58 am

robmack

robmack
Life time member
Life time member
As pointed out, your gear switch is acting up. Based on your symptoms, the Yellow/Blue wire on the switch is permanently open circuit. That could be the switch itself but more probably it is the connector contacts that are corroded or weak, not making contact. Try reseating the TGPI connector on the right side of the bike frame. Also give it a cleaning and check that the metal connectors are in good shape.

I bet if you cycle through the gears, you'll see the following on the gear display: first=1, neutral=1, second=3, third=3, fourth=5, fifth=5


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

8Back to top Go down   Gear indicator Empty Re: Gear indicator Tue Jun 04, 2019 5:47 pm

sidecar paul

sidecar paul
Life time member
Life time member
Dave, before taking out your swing arm to get at the switch, try this idea that I've been using for the last 25 years or soon both of my K's.

https://www.k100-forum.com/t6936-gear-position-switch?highlight=gear+position+switch

For the few pence that resistors cost it's worth trying.

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

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