SOHC.co.uk Forums > CB500/550

CB550 Lost Ignition - Help Needed

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Sesman:
For the bike to fire (I do assume you mean ‘fire’ and not simply ‘turn over’) there must be some contacts working in the ignition switch in order to feed the coils/ignition. This would also suggest that supply to the ignition is healthy too. Did you mean ‘fire and run’ or simply turn over?

Sesman:
If you did mean ‘turn over’ and not ‘fire’ I’d suspect the fuse holder unit. I’ve had two fail in exactly the way you have described. Use a volt meter to check continuity from the fuse box feed (red wire from top of solenoid unit) to the outgoing red cable to ignition switch.
Connections in the fuse unit can become very sketchy over time, but can be easily re-soldered. Try fixing before replacing as OEM is prohibitively expensive and pattern ones are not very good quality.

MrBaklava:
Thanks for your responses everyone.

I traced a fault to the lower section of the ignition switch (white plastic section) as mentioned by Brianj.

Does anyone know where I can pick up a new one? ideally just the plastic so I can retain my original keys.

Also the bike is a 79 CB550k with the steering lock on the headtube rather than on the ignition.

Thanks again to all that helped out!

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McCabe-Thiele (Ted):
Try Kojaycat if you are talking about the block connector.

Sorry could not see the photo on my phone, is it broken or does it just need the contacts cleaning up, Cilit Bang Limescale remover is good for cleaning contacts.

Sesman:
Like Ted said. It’s worth taking the back off (cover with a cloth as the small springs can jump out). Clean with contact cleaner and abrade with wire wool or 400 grade emery and you will be good to go? It’s highly unusual for the triangulated copper contacts to break.

Only risk is that the plastic retaining tags may be brittle, so warm the unit first with a hair dryer.

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