SOHC.co.uk Forums > CB500/550

Cb550k3 Rectifier

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mike the bike:
Mine was the standard Honda item.  The difference between the OEM one and what you've got is, maybe,  the heatsink.   Yours might run a bit too hot and break down.  You can always add a heatsink to it if you think it's inadequate.  With a smidge of heatsink paste.

Johnny4428:
Thanks for that I did wonder about the heat side of it. I will keep an eye on it after a couple of longer runs, I will probably replace at some point with the correct item in keeping with the bike spec. (he says with his electronic ignition)🤫

nairb:
I made up several sets of replacement rectifiers years ago expecting them to fail..... Some with heatsinks and others without.  Not one has failed.  Not had a battery go flat either.

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Another useful thing from fleabay was a small digital readout.  I put some long wires on and clipped it to the handlbars to check the charging voltage.  Nice to see for a few days. All worked as it should with the new setup.  They seem to be reliable
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Johnny4428:
That’s interesting to know. Had my first run out with bike this afternoon, checked rectifier on return and only slightly warm. Funny thing I was wishing I had a volt gauge on the bike to keep an eye on charging.

Orcade-Ian:
Hi Johnny,
I had the same problem of wanting to know battery voltage on our MX-5 - the ECU does the regulating and they seem to charge at or near 15volts, which I am a bit uneasy with.  Anyway, I bought a couple of very cheap voltage displays and fastened one to a cigar lighter plug to do some checking.  You could easily adapt one of these with long wires to somewhere visible - even inside the side panel would give readings you could check occasionally.

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Ian

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