Simplified wiring for a 79 CB650

tron97

tron97

Been Around the Block
Hello everyone,

Since i have showed pictures of my ride, lurked around a bunch, Its time to press you guys for some info.

Just picked up my second project a 79 cb650. Im going to throw this out there, im still a complete and utter fucking noob.

So ive done some digging, and beginning to get a grasp on these bikes. Of course, its a completely different animal compared to the xs.

As far as Im aware (correct me if Im wrong) the charging system is the same from 1979-83.
This consists of a combo reg/rec, electric starter (starter magnetic switch?), 2 coils, alternator, battery.

Basically, i want to minimize it down to the same as my XS. Please dont give me shit for not having a killswitch, or headlight on/off switch, its what I wanted to run. I dont want a killswitch on the honda either, the key is at the bars anyways.

My question is, can I do a similar setup to whats on my xs with this bike?

The things I want to run are front and rear brake light switch, tail/running, headlight hi/lo and running, signals, electric start (these damn bikes dont have kickers!) and have the keyswitch 2 positions. Everything off, and everything on including ignition and lights.

I have zero experience with electric starters. I know absolutely nothing about them. Do I NEED a headlight on/off so more power goes to the starter when starting or can I get by without?

Does anyone have any diagrams, insight, photos, or anything to help me get through this?

Heres a picture of what im working with, and the wiring diagram I used on my XS. I changed a few things but its pretty accurate. I know ill need to wire in the starter too.

Help please!?
 

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Have the whole manual
http://www.jasonkent.ca/cb650manual.htm
Wiring diagram is in the first chapter.

It can be done but there are 5 wires that run into the ignition switch. I converted to a yamaha 3 wire system but you will need to run 2 diodes to prevent back looping into the fuse box. There are 2 green (ground wires in the bucket) get rid of one. As well there is a stop warning lamp with 4 wires, not necessary. It's the box on the triple tree mounted outside the headlight. If you are going to take the wiring harness apart you will see that they've run extra lines for their own reason.

As for electric starters, you will need to by pass the stop switch so it's always activated but the start button is a momentary switch that allows juice from the battery to be dumped directly to the starter. It provides a little power to the solenoid that opens the gate so to speak. The low beam comes on automatically and doesn't have any to do with the starter.
 
So i found this diagram, its for a DOHC cb750, BUT the wiring colors match up pretty well.


Would this work? I would need to of course wire in my lighting, but other then that, how does it look?
 

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I am curious how this is going and how the diagram is working for you. I'm striping down my first project a 79 cb 650 and could learn from your exprience.
 
You need the headlight off while starting. It will drain the battery rapidly when she wont turn over sometime..She might not even have enough juice anyway.
Lower (dohcwire.gif) looks good, but i have a question about the signal wire (grey) to the spark-adavancers. Don't they need a seperate wire or do they spark on the non-work pistonstance as well (dont know how to say it in english) 1 spark every revolution, wether she in the work-revolution or exhaust revoltion.

Furthermore, what are the wires from the puls gennie not used anymore?

The starter solenoid needs a big ground wire. It's missing that. You can not start the engine while the solenoid's ground is main ground thru the system. (well, you could i guess, but it would melt darn fast ;) )

The lock has 4 wires, backbone requires 2. Red in, black out. The orange one in the diagram is to start the engine WITH the key (like turning it or pushing) and blue is some fancy extra black i guess.

You can hook a light up between the black wire, thru a switch, and use green or frame as negative/ground.

ONE THING I'M MISSING IS A FUSE! And you do want one!

Realy clean bike btw! almost to purdy to put the hacksaw in...
 
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