Topic: No Power To Starter !!

[sanddigger]

Hi, All its Sanddigger, I am rebuilding my 1977 CB750a ,all most don, Question ?
I have no power to the stater , But Have power to the buttion but the starter
will not turn all the fuse are all OK  .

[Mr Freeze]

What about power at the starter solenoid?

[sanddigger]

Hi, I For got to say I Have no power  in the solenoid , I  have other one still no power to the starter.

[grcamna2]

Do any of the other electrics work? and do you have a good battery & well grounded ?

[sanddigger]

I have a New battery Lights  work Horn Work Turns Work, but the starter will
not turn ,if you Junp the solenoid it turn over but not by the butten I have power to the butten but will not turn over the engine.

[Mr Freeze]

The solenoid is what lets the power flow to the starter for it to turn over the motor. It is activated by the start button. It should have a green/red stripe wire that connects to the start button and a yellow/redstripe wire that connects to ground. The solenoid might be dead?

[grcamna2]

There is a safety no-start switch somewhere...possibly the rear hand brake or sidestand ? I'd check the wires to that to be sure you're getting continuity to complete the(black/white wire?)ignition circuit.

[stikman]

I'm resurrecting this thread because I am having the same issue and couldn't find the answer.  I partially rewired my 77 cb750a and can't get the starter to work other than jumping it directly at the solenoid.  The solenoid should be fine, as it worked before I modified the bike.  I hear tell of a fabled stock wiring setup on the matics that cuts power to the starter.  I believe this is most likely my issue but I don't know which wires are involved in this.  Can someone please shed some light on the matter?  Cheers!

[grcamna2]

There is a safety no-start switch somewhere...possibly the rear hand brake or sidestand ? I'd check the wires to that to be sure you're getting continuity to complete the(black/white wire?)ignition circuit.

Do you have a oem Factory Honda service manual w/ a good wiring diagram? take a look at the safety switches and their wiring;also the rear brake pedal/parking brake safety switch may be no good.

[stikman]

So I studied some of the wiring diagrams that I could find and figured it out.  To bypass that whole "changing relay" and "solenoid valve" system on these bikes you just run the green/red wire from the starter solenoid to your starter switch (I'm using a turn key instead of a push button), and run the red/yellow wire from the starter solenoid to ground.  Now my electric starter actually works.  No more emergency kick start.   

*Note: I am using a tach in place of the stock gauge with the lights for neutral/low/drive, etc.  This probably won't work for anyone wanting to keep that gauge.  Tach is more useful anyway.