Topic: CB900F M Unit blue wiring

[LukeN74]

Does anyone have an actual finished diagram of the 81/82 CB900f with an m unit? I’m almost complete (I think) but my solenoid seems to want a ground and not the power from the “start” output on the m unit. Not sure how to convert it or if it’s even correctly setup that way. If I ground the green to the frame I get the m unit blinking, and otherwise just regular setup I get no response when hooking the start output to the red/white wire from the rectifier to the solenoid. What fires the starter is running a ground to the empty terminal on the solenoid (not the red/white, not the 12v sensing black, and not the green “ground.” Ignition on, they all seem to get 12v as well not sure if that’s normal.

Thanks

[calj737]

You won’t likely find what you’re looking for here since the 900 is a DOHC motor and this site is focused on SOHC motors.

I can look later today at the stock diagram and perhaps give you an answer, but there are 900 owners on here who may be immediately familiar with your issue (not using an mUnit).

[LukeN74]

That would be great. I understand I’m on the SOHC forum but I’m reaching for strands. I’ve seen finished bikes but cannot find a diagram for the life of me and pulling my hair out every night working on the thing. Thank you. In the meantime I will keep searching.

Cheers!