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1977 RD400 Cafe Racer conversion project

8347 Views 41 Replies 15 Participants Last post by  snorkelfork
I am just starting to convert my 77 RD400 into a café racer. I have it all stripped down and am taking it to powder coat this week. I have heard of the "M" Button wiring kit to help me put it all back together with new parts. Have any of you used the M button wiring system on your bikes?
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You'll certainly have your detractors about the M-Unit. Check out Motogadget's and Revival Cycle's websites, and see if the features make it worth it to you. I use them on my builds, and have no regrets. It's a one time purchase that I consider a nice upgrade.


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Soldering creates areas of potential failure. Pro quality crimps are the way to go. You won't find soldered joints in the miles of wire in commercial airliners.


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ok it was 540Nova's central ground bar:

View attachment 51465

I mean...how freaking clean is this? It's pretty badass

If the M-gaget gets rid of relays, how many relays are we talking about here? headlight, horn, starter, taillight/brake?

still have to do something about the fuses and such.
Thanks , Geeto


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Everyone has valid points. The M-unit is not the final answer, and is certainly not for everyone. The Beaver and PC-8 units are practical solutions, but really aren't comparable to the M-unit, as people have pointed out, and isn't intended to be. A couple features not mentioned are programmable brake light modulation, (4 or 5 modes if I remember correctly), and programmable daytime running lights using the turn signals. You can easily select the intensity (10%, 20%, etc).
Aircraft don't use soldered connections due to vibrations, something our bikes suffer even more from. As a Lead Aircraft Mechanic for United Airlines, doing heavy maintenance in our Newark hangar, I've seen every wire on our planes from 737s to 777s. Using modern tooling, it would be easier to solder wiring initially and during repairs, but it's just not done. Ironically, Motogadget recommends soldering with their products. It's your choice.


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Better shot of the ground bus...



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