SOHC.co.uk Forums > CB350/400

Starter button no go.

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exvalvesetdabbler:
It's also possible that the brushes in the starter motor are stuck in their slots, they wear down over  time resulting in less spring pressure and add in a bit of carbon dust gumming up the slides.

A jump lead from the battery +ve to the starter motor terminal( need the sprocket cover off to access) should make the motor spin.  Alternatively a thick screwdriver across the starter solenoid terminals  should make it spin up.

However if this was the case you would still hear a click from the solenoid when you press the start button but no starter motor.

So
If the solenoid clicks when you press the button  - check as above
If the starter solenoid doesn't click - check wiring and switches, that includes all the bullet connectors in circuit, IE pull apart connectors , squirt of WD40 then re connect and disconnect a couple of times to wipe the contact.

My first port of call though would be to drown the handlebar switches in WD40 while exercising them, do it a few times, mopping up with a tissue in between. This means splitting the two halves of the switche gear to get at them. The starter button contacts can get quite gunked up with all the lube from the throttle cable attracting muck.

Regards
Dave

Rayzerman:
FYI, there are plenty of starter button kits available, should that prove out to be the issue.

Athame57:

--- Quote from: TrickyMicky on January 03, 2026, 08:24:20 AM ---I am NOT an electrician, but before you start pulling things apart, a couple of simple checks. IS the neutral light working? If you have the clutch switch fitted, try it with the lever pulled in.

--- End quote ---
Pulling the lever worked!  ;D I've opened up the switch housing and sprayed in WD40. I'm not there yet, too cold to work outside at my age, but things look like there're going to be sorted.  8)

Seabeowner:
If this is now only starting when the clutch is pulled in I think there is a fault in the starter safety circuit. It is supposed to start if either the clutch is pulled in OR if it is in neutral. If the neutral light is working this means the neutral switch connection is probably good. There is a diode under the L side panel that could be U/s or a poor connection. Check LG/R wire....when it warms up a bit....maybe April.

Athame57:

--- Quote from: Seabeowner on January 04, 2026, 07:00:51 PM ---If this is now only starting when the clutch is pulled in I think there is a fault in the starter safety circuit. It is supposed to start if either the clutch is pulled in OR if it is in neutral. If the neutral light is working this means the neutral switch connection is probably good. There is a diode under the L side panel that could be U/s or a poor connection. Check LG/R wire....when it warms up a bit....maybe April.

--- End quote ---
Hi
Do you mean this? https://www.davidsilverspares.co.uk/by-part-number/hpart_31700124003

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