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Sorry but Hondaman's post in the thread referenced by ' bellcow ' is wrong......a black +12V would never go to a Green-with-red-tracer as it is a switched ground...i.e. it is a ground wire when in Neutral or some other switched condition..... sorry ,but my post of 1 jumper between two wires is correct if you really want to do away with the safety switch ( no start in gear or no start without clutch pulled if in gear, start as usual in N , starter engages any time you hit the button if by-passed )
With respect, the original posters question was concerning K3 wiring( actually up to K5 ) where the green/red was a switched ground...wait, no, K6,7,8 F1,F2, still a switched ground...even K0 ( light green/red )......green/red on the solenoid is also a switched ground..i.e. waiting for the trans. to be in N or the clutch to be pulled to send ground to the solenoid.....
If you unplug the SSU and remove it you can by-pass it's function by jumping the solid Green wire to the Dark Green/Red wire( there is also a light green/red ). That's it, your done........the starter will now spin whether your in gear or N or clutch is pulled or not... N light will still work when in N 'tho...........
The picture makes it very clear which wires are being jumped.I am restoring a bike now and have a new wiring harness and I wanted to make it all a 1975 wiring plan but right handlebar switches are very hard to find.I may have to do away with the starter motor safety switch after all.You cannot buy them anymore so I might as well get rid of it.Thanks for you help and patience.BTW...What YEAR CB750 did you do this jumper wire modification on? Thanks.
When you unplug the SSU you are left with a red multi pin connector, you make a jumper wire to go from the green/red to the solid green.If you don't have the SSU plugged into you harness use you wiring diagram to find this red connector.Let me know if you want a pic.
I know this is an old thread but I feel this is the best place to place my question. Would it be possible to jump the "light-green/red" wire with the "Dark-green/red" wire if a diode was soldered in the "jump wire" allowing current to flow from the "light-green/red" wire to the "Dark-green/red" wire only? To clarify, the diode would allow current to flow from the neutral switch to the clutch-switch wire that feeds the engine start button only, and not the other way around. This way we can remove the starter safety unit, but still only allow the bike to start when the bike is in neutral OR the clutch lever is being squeezed. Thanks in advance, and I hope the wording of my question isn't too confusing.
I recently had to replace the diode in my K8 after chasing my tail trying to figure out why the neutral light would not go off.
It sounds like you are describing the later model configuration. The 77/78 CB750's used a diode exactly the way you describe. I recently had to replace the diode in my K8 after chasing my tail trying to figure out why the neutral light would not go off. Look at the wiring diagrams for the 77/78 models. I'm not sure if the early harness has everything you would need to make the conversion, but it sounds good in theory.
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