Author Topic: Bypassing the side stand switch on a K100RS4V, K1 or K1100  (Read 14801 times)

Offline frankenduck

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Bypassing the side stand switch on a K100RS4V, K1 or K1100
« on: June 05, 2011, 08:14:11 AM »
2021 Update: 

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/ssbypass/ssbypass.htm


Old post:

Many people, myself included, like to be able to run their 4 valve K bikes with the side stand down.

Here's three options for bypassing the side stand switch:

a) Purchase BMW part number 61121459998 and plug that into the side stand wiring harness connector under the seat on the right side.  The name of that part is a "contact ring."

b) The part above is just a loop of wire that shorts the two terminals fooling the Motronic into thinking that the side stand is up.  All you really need to do is cut the two wires (brown and brown/blue) and connect them.

c) Do a or b above and then wire the side stand switch up to a relay that illuminates a warning light to let you know that the side stand is still down. (what I do on my bikes - and it still isn't 100% effective :o)

DISCLAIMER: When you bypass the side stand switch you are overriding a safety feature BMW built into the bike.  Riding off with the side stand down can be dangerous.  If you decide to do this then you do so at your own risk.

Disclaimer aside, if you do ride off with the side stand down and try to make a left turn then it tends to be self-retracting once it first touches the ground without disrupting the bike too much but it will still screw up your first left turn so if your first left turn is at speed on a tight turn then you could be in for a world of hurt.
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Offline Inge K.

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Re: Bypassing the side stand switch on a K100RS4V, K1 or K1100
« Reply #1 on: June 05, 2011, 10:56:22 AM »
Hi!

A cheap and simple substitute for the "contact ring" from the Swedish BMW forum:

Inge K.
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grandiosedelusionary

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Re: Bypassing the side stand switch on a K100RS4V, K1 or K1100
« Reply #2 on: June 05, 2011, 11:47:30 AM »
Anything other than motorcycle specific wiring can cause a fire.

Offline Inge K.

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Re: Bypassing the side stand switch on a K100RS4V, K1 or K1100
« Reply #3 on: June 05, 2011, 12:02:09 PM »
Anything other than motorcycle specific wiring can cause a fire.

On early models it feeding the coil to one relay, on later models it grounding the coils
on two relays................minimal current flow.

Inge K.
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Offline Inge K.

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Re: Bypassing the side stand switch on a K100RS4V, K1 or K1100
« Reply #4 on: June 13, 2011, 10:54:29 AM »
Another solution from the Swedish BMW forum:

This involves a standard (NO) relay, and is a permanent modification.


Connect the relay contacts paralell with the sidestand switch.

Signal/feed to relay coil connected to the circuit clutch/neutral/starter button.
Best acces here would be black/green wire at the connector for the RH
switch assembly under the tank.
Another possibility is at the clutch switch connector, just be shure to connect
to the correct wire......black/green, and not the green/black.

And of course other side (85) of relay grounded.


Now it`s possible to run the engine with sidestand down, but if you try to
drive away, the engine cuts as soon the clutch is released.


Inge K.
  • Norway

Offline frankenduck

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Re: Bypassing the side stand switch on a K100RS4V, K1 or K1100
« Reply #5 on: June 13, 2011, 11:59:00 AM »
Another solution from the Swedish BMW forum:

This involves a standard (NO) relay, and is a permanent modification.


Connect the relay contacts paralell with the sidestand switch.

Signal/feed to relay coil connected to the circuit clutch/neutral/starter button.
Best acces here would be black/green wire at the connector for the RH
switch assembly under the tank.
Another possibility is at the clutch switch connector, just be shure to connect
to the correct wire......black/green, and not the green/black.

And of course other side (85) of relay grounded.


Now it`s possible to run the engine with sidestand down, but if you try to
drive away, the engine cuts as soon the clutch is released.


Inge K.

It won't cut out if you're in neutral though because the gear indicator feeds that same green/black wire.  Either way though you can't ride off with the sidestand down since the bike will quit once you put it in gear and then let out the clutch.
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
K Bike Maintenance & Mods: Click here.
Buy parts here.

Offline Inge K.

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Re: Bypassing the side stand switch on a K100RS4V, K1 or K1100
« Reply #6 on: June 13, 2011, 01:53:29 PM »
It won't cut out if you're in neutral though because the gear indicator feeds that same green/black wire.  Either way though you can't ride off with the sidestand down since the bike will quit once you put it in gear and then let out the clutch.

Was quite aware of that possibility, but did leave it out of the text since it`s rather
uncommon to drive off in neutral.
But of course it`s worth to mention for those with a faulty gear indicator switch.

Inge K.
  • Norway

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