SOHC.co.uk Forums > CB350/400
Starter button no go.
Ken4004:
I had a similar issue when rewiring my bike, starter button not working.
I checked the wiring with a volt meter and had no continuity at the switch so decided to take it apart and found lots of corrosion the green copper type.
Stripped the switch down and cleaned up all the contacts and the switch started to work, it’s just a basic push button switch to make the circuit but the design is not great and a bit fiddly to put back together but like everything else on this bike just needs a bit of patience.
I had exactly the same issue with my Z1000 a couple of years ago , water gets into the switch and corrosion takes over.After I cleaned everything up added some switch cleaner to ensure good contact at the switch.
Bryanj:
That ds part is the later version, early version was a big box with a multi pin red connector
Athame57:
--- Quote from: Bryanj on January 05, 2026, 06:20:22 PM ---That ds part is the later version, early version was a big box with a multi pin red connector
--- End quote ---
My bike is a 1977 build, 1978 registration. F2 8)
Bryanj:
Never really looked closely at the system but i thought the diode worked on both clutch switch and neutral light
exvalvesetdabbler:
It's easy enough to test the diode if you [ Guests cannot view attachments ] have a multimeter of failing that , a battery, small bulb and some wire. A pilot light bulb or similar would do.
Just connect up the bulb to the battery and confirm that the bulb is good. Connect the diode in series with the bulb and test again. Connect the diode opposite way round test again.
Bulb lights up both ways - diode shorted
Bulb doesn't light either way - diode open circuit
Bulb lights up one way and not the other - correct
I would be surprised if it has failed, they're pretty reliable devices unless they suffer abuse through over voltage or excess current.
If it the same as mine , the diode symbol is marked in the molding of the plastic.
Regards
Dave
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