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CB400F Motogadget m.unit thread

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zombie365:
Hi all,

So currently planning my rebuild of the 400/4 I've scrapped the wiring loom and gone for the Motogadget m.unit blue.

Bike is going to be café racer style, hopefully not upset the purists to much! ;)

https://motogadget.com/shop/en/m-unit-blue.html

I'm after any tips or tricks when wiring this thing up and thought it would be useful to set up a dedicated thread, to help anybody else (and me) doing a similar thing to there 400/4. I design electronics for a living so not unfamiliar with this sort of stuff... although I've never done any major motorcycle wiring!

I am literally at the start, so to begin here's there "simplified" wiring diagram from moto gadget:

[ Guests cannot view attachments ]

Does anybody have a more defined wiring diagram for m.unit and 400f ?

I'm looking to use the original regulator/rectifier and an antigravity (or something similar) battery.

Any input greatly appreciated!  :)

Thanks

Bryanj:
Ag battery will not like the origial reg rec set up as the charge settings are too coarse and top volts notaccurate enough

K2-K6:
Has it any facility to monitor oil pressure switching and display?

Should be reasonably simple for usual function as there's not much to do on these bikes, two light filaments front and rear, horn, indicators, feed for ignition coils.

Can see a speed sensor input, what does it need to feed that?

zombie365:
Thanks for your reply K2-K6. :)

I'm unsure whether the m.unit has any oil pressure monitoring capability, although it does have some aux inputs that are configurable. I've had a quick skim through the manual an it doesn't seem to mention oil pressure, I could be wrong. however the Koso Speedo/clocks I'm going to use does have an oil pressure light. I may need to wire the existing sensor directly to the clocks. I'm guessing this is just one of the wires coming directly from the engine?

https://www.kosoeurope.com/en/speedometer/d64-custom-style/996/d64-custom-style-multifunctions-meter-black-10000-rpm-tuev-approved?c=3052

The m.unit came with a magnetic sensor and some tiny magnets that are meant to be attached to wheel. It is not necessarily needed for it to work, but is used to record mileage for servicing, travel distance ect.

I'm looking to use an analogue to digital speedo cable and rev counter cable to interface with the Koso clocks and hopefully splice the speedo output to interface with the m.unit.

https://www.digital-speedos.co.uk/speed-sensors-c9/daytona-cable-to-digital-converter-for-suzuki-and-honda-models-please-click-on-listing-for-models-covered-p794

Thanks

Sam

eight0:
Oil pressure: You need an idiot light, it doesn't monitor oil pressure in the M unit, but you do run power to the light from Aux 1 or 2.

Speed sensor: Correct, This is just so the M unit can track your rides/service intervals. You split the signal wire from the sensor to the Gauges and to the input on the M unit.

Reg/Rec: As Brian says, you can't use the original reg rec units (edit: with a lithium battery). You should also not use a cheap eaby unit. I bought the Ricks reg/rec, expensive, but they are tried and tested.

This is the best diagram I have found, It's also editable in illustrator.  https://technicalarticles.revivalcycles.com/hc/en-us/articles/360009106131-m-Unit-Blue-Basic-Universal-Wiring-Diagram

side note: The M Button will not work unless installed inside steel bars, so if you are going aluminium clip-ons, don't buy one.

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