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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Leooo on April 03, 2020, 04:56:15 PM

Title: K100RS 16v Running rich - How to test for Temp. Sensor
Post by: Leooo on April 03, 2020, 04:56:15 PM: Hi everyone,

My bike has been running rich for quite as while, and recently it got harder to start the bike, I have to activate the choke for 2 kms otherwise the bike will stop at red light or in-between changing gear if I dont go fast enough. But after 2 kms or a few minutes, it goes well, I can put back the choke and I don't have any issue anymore, the idle is at 1000rpm.

I've tried many things, changing the battery, changing the spark plugs, cleaning the coals, etc. It's still the same issue, being worse when it's cold outside (for instance worse around 0°c then when it's 15°c).

So I want to test for the Temperatur sensor, I've been reading a lot on the forums and it seems quite trivial to test but I didn't found any clear tutos yet, so this is what I am asking :

Here is a picture of the motronics connector, I have to test for the #10 and #13 pin (or the ground instead of the #13?)
So counting from 1 to 13, top row, left from right?
(https://i.ibb.co/R6W7C2X/20200328-144357.jpg)

I use a multi meter like the one here under. Since we are looking for resistance, I should put it to Ohms, but which level? 200? 2000? 20K? I am lost here.
"-" to the ground, "+" in the #10 pin?
(https://i.ibb.co/12X3gcr/Capture-d-e-cran-2020-04-03-a-22-15-38.png)

If the values are correct at the Motronic connector, I'll have to check the value directly from the sensor over here?
(https://i.ibb.co/86Mbj09/20200328-144335.jpg)

As u can see, the spark plugs were very black with deposits
(https://i.ibb.co/syyNy8Q/20200328-113207.jpg)

I am really willing to learn, I just have so many questions and don't know where to find the specific answers, if u could help me it'll be greatly appreciated, I'll work on the bike tomorrow during this lockdown. I with to all of you good time working on the bike waiting for the better times to come to go on a ride :)

Cheers,
Léo
Title: Re: K100RS 16v Running rich - How to test for Temp. Sensor
Post by: volador on April 03, 2020, 06:42:03 PM: when measuring resistance you don't need to worry about the polarity + or '-' put the meter in 2000 setting

all the Motronic test procedures are in .PDF here http://www.motobrick.com/index.php/topic,13442.0.html (http://www.motobrick.com/index.php/topic,13442.0.html)

Motronic description here http://www.motobrick.com/index.php/topic,13441.0.html (http://www.motobrick.com/index.php/topic,13441.0.html)

CO potentiometer adjustment here http://www.motobrick.com/index.php/topic,13180.0.html (http://www.motobrick.com/index.php/topic,13180.0.html)
Title: Re: K100RS 16v Running rich - How to test for Temp. Sensor
Post by: volador on April 03, 2020, 07:53:09 PM: Some links for your K journey
Check parts compatibility with BMW MAX Microfiche, BOBS BMW, REAL OEM

https://shop.maxbmw.com/fiche/PartsFiche.aspx

https://shop.maxbmw.com/fiche/PartsSearch.aspx

https://parts.maxbmw.com/BMW___BmwMotorradK.html

https://www.bobsbmw.com/store/microfiche/BrowseSeries.aspx

https://www.realoem.com/bmw/select.do?kind=M&arch=1

https://www.ascycles.com/BMW-Motorcycle-Parts-Fiche

Cross reference parts like Bosch pn#'s, etc.... http://partsplusecat.com/
No spaces in the part number

Parts Vendors

https://www.beemerboneyard.com/

https://www.capitalcycle.com/

https://www.euromotoelectrics.com/

https://www.tills.de/

Headlight relay stuff if you chose to add one

https://www.motobrick.com/index.php?topic=268.0

http://www.motobrick.com/index.php/topic,4962.msg30932.html

http://culayer.com/product/matchbox-headlight-relay/

http://easternbeaver.com/Main/Wiring_Kits/H4_Kits/h4_kits.html
Eastern Beaver site is a great reference for electrical connectors,plugs, etc...

http://www.k100-forum.com/

http://www.kforum-tech.com/Tech-page.html

http://www.kforum-tech.com/electrical/EFI/bike-wont-start-EN.htm

http://www.kforum-tech.com/Downloads/electrical/diagrams/interactive_diagrams.htm

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/k100tshoot/K100.Troubleshoot.Start.2018.pdf

http://kbikeparts.com/index.htm

http://www.kbikeparts.com/classickbikes.com/ckb.tech/ckb.new2k.htm

http://www.kbikeparts.com/classickbikes.com/ckb.tech/ckb.tech.toc.htm

http://www.eilenberger.net/K75S/IgnitionSwitch/

http://www.verrill.com/moto/moto.shtml

this site has a lot of good info and breakdown pictures in the tech and tech resources sections for K1100 alot of the parts are on K75 & K100

http://www.k11og.org/forum/index.php?sid=2df953dde5715fd9001fbe69edec5ad0

https://ibmwr.org/index.php/k-bike-tech-articles/

This site has all kinds of technical specifications on all the BMW models http://www.bmbikes.co.uk/mechanicalpages/kseriesmechanical.htm

http://largiader.com
Title: Re: K100RS 16v Running rich - How to test for Temp. Sensor
Post by: volador on April 05, 2020, 04:06:46 PM: If you measure resistance at the installed temp sensor don't measure the resistance between both pins on the connector; that is the wrong method

Measure the resistance between either one of the pins and the main body of the sensor

If you replace the temp sensor do not use teflon tape on threads, may or may not interfere with grounding the sensor body
Title: Re: K100RS 16v Running rich - How to test for Temp. Sensor
Post by: Leooo on April 08, 2020, 07:45:00 AM: Thank you very much Volador for all those informations ! I'll look into it and try to check on the bike as well once I understood this !