SOHC.co.uk Forums > CB350/400
Sudden engine cut outs
Oddjob:
Need more info, does the engine stops but the lights etc stay on? Just an engine stop could mean the kill switch contacts, full shut down is most likely an ignition switch fault
Cappodimonte:
Just a thought but, how long has the battery been on the bike ? Is it an old lead/acid or new gel type
If it’s been in situ for a fair while and is lead/acid it could be a battery plate has part failed and vibration causes a separation, short and immediate stop. The other fail points are kill switch or ignition switch, check ALL connections however and clean them up, electricity can build up resistance at rusted or corroded connection points
If it’s a gel battery then get it professionally checked out, anything electrical can fail anytime, these things can really wind you up.
Athame57:
--- Quote from: Cappodimonte on October 26, 2022, 09:33:25 PM ---Just a thought but, how long has the battery been on the bike ? Is it an old lead/acid or new gel type
--- End quote ---
I put the current battery in four years ago, it looks alright but I've never had a bike so long as this, I'll change it. I see on DSS the battery they offer for the CB400F is a gel type now, anyone experienced this offering of theirs yet? Now and then the starter button doesn't respond, usually first push of the day, by moving the kill switch and pressing....then putting it back and pressing it works again. I've opened it up but can't see anything wrong as meets the eye though. Maybe try some WD40?
Laverdaroo:
Sounds like thats the culprit. Clean it towithin an inch if its life and re test then move down the wires. Cheap and easy.
400 Cafe Racer:
--- Quote from: Athame57 on November 02, 2022, 05:00:56 PM ---
--- Quote from: Cappodimonte on October 26, 2022, 09:33:25 PM ---Just a thought but, how long has the battery been on the bike ? Is it an old lead/acid or new gel type
--- End quote ---
I put the current battery in four years ago, it looks alright but I've never had a bike so long as this, I'll change it. I see on DSS the battery they offer for the CB400F is a gel type now, anyone experienced this offering of theirs yet? Now and then the starter button doesn't respond, usually first push of the day, by moving the kill switch and pressing....then putting it back and pressing it works again. I've opened it up but can't see anything wrong as meets the eye though. Maybe try some WD40?
--- End quote ---
Failing all else, as a belt and braces solution, you could wire a "Secret Hidden " bye pass switch, concealed from view. Wired direct from the battery - through its own seperate fuse - and connected to the ignition switch output wire. This would enable you to get home without being stranded. If the Ignition switch or fuse or anything on the live side fails you would be covered. :)
Dennis
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