BMW K100 MOTOGADGET M-UNIT WIRING PART 5

Hello people and welcome back to part 5 , in this part we continue wiring the m-unit with its main power supply cables and the cables for the starter motor

[@mattmc8011]

Another great and informative video mate. I brought a 83 K100RS a month ago, a week after I finished watching your BMW series. Keep up the great work, I refer to your videos as much as the workshop manual and I look forward to getting to the wiring because of your content. Motogadget should sponsor the build of your black K100 after all the sales I'm sure they will make due to your videos. Your electrical videos due to your background and knowledge are a notch above anything else out their so a multi-meter video would be great. Thanks for all the effort you put in.

[@mikeyfrompiha]

Thanks Matt ! I think they should sponsor me also ! Ha ha , good luck with your build mate !

[@valexandruc]

Hello mike. I've seen you videos yesterday and since UK is in lockdown I thought I should start working on the bike today. Already choped the box and the cables. now waiting for my munit and your videos 🙏

[@mikeyfrompiha]

Hello there , not sure when I will be able to continue this project , as the bike is not mine the owner has the frame at the welders but they are on lock down also , then it needs to be powder coated etc ,,, so who knows when we can continue ?? !!

[@sirk4906]

nice work!! really nice work, thanks for helping people we don't know with cables

[@mikeyfrompiha]

No problem ! Glad you are enjoying the videos !

[@petenisbet2809]

Top work, as usual Mikey!!!

[@mikeyfrompiha]

Appreciate that

[@ptitflow77166]

Hi Guy, Great video ! I also have à bmw k100. I began to disassemble it, and i would like to do the same work on my harnesses. So i follow your videos with great interest to reproduce your work. I cant wait to see more. Thx Guy !

[@mikeyfrompiha]

Hello Florent ! Glad you enjoyed the video !

[@KonstantinStanchev]

Great job, indeed! Your videos will be of much help for future generations! I can't wait to start my own bike. WIsh you all the best, Mikey!

[@mikeyfrompiha]

Thank you and good luck with your build !

[@KonstantinStanchev]

@@mikeyfrompiha Thanks, Mikey!! :)

[@FanisNikoletos]

Your videos are just amazing!!! Really good job, thanks a lot for your help ! 👍

[@boomhour1976]

thanks for your awesome videos. they've been really helpful with my 86 k100 build. I have a question as there are some differences between your wiring setup and Ben's Eighty 20 videos. From the Ignition module there is a brown and red wire that he shows connecting to the ground side of the starter relay. You show the ground simply going to earth on the bike. In your setup where are you connecting the brown and red wire from the Ignition module? I'm setup per your diagrams but I'm not getting spark so trying to troubleshoot that. thanks again for the great videos.

[@barbelis]

really love your work, keep us posting! Very very helpful nice and easy!

[@mikeyfrompiha]

Hello Algis , due to the current circumstances this project maybe on hold for a while , but as soon as I can get my hands back on the bike I will be back to more videos !

[@brendano654]

Keep the videos coming. I'm relying on these to fit my motogadget on my k1100

[@mikeyfrompiha]

yeah cool man , just a note this is a '84 k100 , the wiring maybe completely different to your K1100

[@brendano654]

@@mikeyfrompiha I under stand but it can at least get me 90% of the way there

[@sigma_kappa]

Heat shrink brown is ground maybe? Beautiful wiring btw

[@mikeyfrompiha]

Thank you , they dont sell brown where i buy mine from , i must have words with them about that !

[@jessegroepenhoff8083]

Hey, really loving this serie so far and its really gonna help my build on my k100rs with an m unit. I was wonder what Battery are you using to power the bike up? Looking at a smaller Lithium one but dont know which to choose. Cheers and keep up the great work!

[@mikeyfrompiha]

This is not my bike so unsure what the owner (Greg) is going to use ? Maybe the original? I used a Shorai LFX19A4-BS12 285cca High Performance Lithium Battery on my bike and that works great ! Glad you are enjoying the videos !

[@jessegroepenhoff8083]

@@mikeyfrompiha Thanks for the quick response! I look forward to see the completion of his bike :)

[@Rhodesy1108]

Hi Mike, Great video, just what i need for my K100 Custom, could I kindly ask you a question. What spec cable did you use for the live to the MUnit and the Starter Relay? Thanks in advance Andy

[@mikeyfrompiha]

just automotive wire , minimum 6.0mm2 for starter motor

[@pugbuguk327]

good stuff very informative

[@mikeyfrompiha]

Glad you enjoyed it

[@moritzjerus7606]

Hello Mike, Thank you for doing such a great job! I restarted my coffee racer project after finding your channel! gives me soo much motivation! I thought it would grow old in my cellar. I am curious for your next vids! keep on performing ! Best whishes! Moritz

[@mikeyfrompiha]

Hello there ! Thank you for the kind words , unfortunately due to the current world situation this current M-unit project has come to a stop , until I can get the frame and engine etc back not much more I can do . Good luck with your build and keep in touch !

[@greventhebeast]

Love your work bro !

[@mikeyfrompiha]

Glad you enjoy it!

[@christopherhodge7808]

Yes Mikey, be interested to see you use a Multimeter.

[@mikeyfrompiha]

Ok cool man , ill look at doing that !

[@robertocagliuso2080]

Ciao Mikey, what is the breakout box for? Is it essential? where to buy?

[@bassridewojtek9051]

Great job !!!

[@mikeyfrompiha]

Thank you! Cheers!

[@Nefarious2870]

Mikey these videos are brilliant and I'm about to cut into my loom! Wish me luck but I've got mostly the same as your fitting so I'm sure it'll be fine. One question is what guage battery/ ground wire are you using AWG and/or mm, as I'm in UK?

[@mikeyfrompiha]

Hey Richard , glad you liking the videos , as for cable sizing i used 10mm2 or 8awg for everything of high current draw , for example battery , starter motor and all grounds , Haynes manual shows 6mm2 or 10awg , i think i used 10mm2 just because thats what i had available in my workvan , hope this helps and good luck with your build !

[@Nefarious2870]

@@mikeyfrompiha Cheers buddy, I may split the difference and go with 8mm2 as it'll be much more than needed and it available. 👍

[@Rhodesy1108]

Hi Mike, In regards to your M-Unit wiring videos. Can you advise me if the OEM Speed Sensor works with the M-Unit and the Motoscope Pro? Hope you can help me. Thanks Andy

[@mikeyfrompiha]

i used the one that came with the m unit , it was easier , think you have to have some circuit board to convert the bmw signal to one the motogadget unit can read , so i didnt go down that road

[@dougaccatino1840]

Great work! Did I miss it or did you not yet cover how you dealt with the charging circuit?

[@mikeyfrompiha]

Hello Doug , no we have no gotten that far yet , due to the current circumstances things may just get held up slightly , as soon as I get my hands on the bike again we can continue :-)

[@jensbolle6793]

what a nice work. thank you. wirklich danke.

[@mikeyfrompiha]

Thanks Jens !

[@jackk1296]

Mate how different is the k1100 wiring

[@craigcrawley514]

Great content Mike. I've been hooked on your videos for weeks now. I've just purchased a K75 and looking to do a very similar rewire fitting the motorgadget equipment. Would this process with the K75? Thanks for your time.

[@mikeyfrompiha]

Hello , as long at as its in the '85 to '96 years you should be good , though i have never personally worked on a K75 before , good luck !

[@craigcrawley514]

@@mikeyfrompiha great thank you Mike. It’s 1995 and looking forward to getting started. Keep the videos coming

[@Borrelaas]

Amazing videos, i´ll be using your videos as a base guide for my own project. Could i ask you what dimension your cables are? 5:55

[@mikeyfrompiha]

Hello again , i will be doing a video shortly on cable selection etc in the next day or so

[@Borrelaas]

​@@mikeyfrompiha looking forward to it!

[@jamiebanks374]

Hi Mikey. What size cable are you using for the heavy draw on the starter relay circuit. And is it automotive cable or your electrical stock from the van ?? Thanks mate 👍

[@mikeyfrompiha]

Hello , its a 6mm2 flex (not sure what that is in AWG) it was some cable I had left over from a job wiring a 3 phase motor , the motor is a submerged hydraulic pump so the cable insulation is rated to be ok with oil and other chemicals , if you had to go buy some cable I would go to an Automotive electrical business , don't buy the stuff from a hardware shop .

[@jamiebanks374]

Hi Mikey, I've got around to making up my loom. Working off your drawing and checking as I go. I noticed pin 9 on the ECU goes off to the mass flow but on the original wiring diagram I noticed 12v from the ignition. My question is do I need to run a feed to pin 9 ??

[@mikeyfrompiha]

@@jamiebanks374 Hello Jamie ,yes 12v+ to pin 9 , it feeds the fuel injection module and the mass air flow sensor and the injectors and the throttle position switch , find the green with a red stripe and you are golden ! Good luck

[@jamiebanks374]

Thanks Mikey 👍

[@mannymaniac4007]

Can I follow these exact steps for a 93 kx1100?

[@mikeyfrompiha]

Hi there , no sorry not for an 1100

[@mannymaniac4007]

I noticed the wiring is a little different lol, wish there was a video for a 93. Its very close though

[@nitonas]

So basically all of this could applied to a k75 rewiring?

[@mikeyfrompiha]

I have now done three motogadget/k100 rewires and all on K100's , I guess the K75 would be very similar

[@sirk4906]

can you upload a video explaining the multimeter? I would be very grateful

[@sirk4906]

oh, i have seen it in the next video, thank you very much from spain.

[@mikeyfrompiha]

All good my friend !

[@isofly28]

Interested how to use a multimeter! 🙋🏻‍♂️

[@mikeyfrompiha]

Go have a look at part 6 Alex ,,, hope you enjoy

[@jamashn100]

Great videos, they have been very helpful for my build. I have a couple of questions - 1. How are you getting away with not using a fuel injector relay? 2. Do you know how to get the neutral indicator light working with the Motoscope pro, I can get the light to come up by grounding all three yellow + other coloured wires coming out of the gear box but not sure how to wire it up. I have read on forums that the only way to get it to work is to buy an after market mod (see link) to get it working. OR can I just not hook it up? Thanks in advance for your help! cafe4racer.eu/en/bmw-cap-monza-universal-parts/888-ebaling-neutral-start-on-bmw-k100-k1100-k75-series-acewell.html

[@mikeyfrompiha]

Hello there , ok question 1 , the old fuel injection relay is just that , a relay that sends power to the injectors / fuel pump etc ,,, well the motogadget outputs do exactly that , they trun on and send power to the injectors and fuel pump , and when you hit the "kill" switch it turns them off . Question 2, if you go watch my other series and this video in particular kzbin.info/www/bejne/hp2bmp-ooLqJl5I , you will see me explain how I got my neutral switch working with out using the stock BMW gear box switch , if you do decide to use the stock BMW switch then yes you have to buy an aftermarket unit to get the neutral light to work , some people don't even bother with the neutral ight ,,, hope this helps you out !

[@jamashn100]

@@mikeyfrompiha Thanks Mikey, Do you have any diagrams re how you're wiring up the kill switch and start switch. Appreciate the help! You should start an instagram page with your builds.

[@mikeyfrompiha]

Cheers James ! Yes I do have a wiring diagram , let me know an email I can send it to or PM me on insta @mikeyfrompiha

[@jamashn100]

Just sent you an insta Dm. Thanks mate!

[@dasjabroer9264]

@@mikeyfrompiha hee Mikey, great video again! I was wondering about the fuel pump relay aswell. My understanding was that without the fuel pump relay, the pump will keep on running with the key turned, even before the motor starts. Is that correct? And if so, will the relay prevent that?