Author Topic: Cb550k3 Rectifier  (Read 2743 times)

Offline Johnny4428

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Cb550k3 Rectifier
« on: June 28, 2020, 05:57:45 PM »
Hi everybody, anybody cruising today? Went for a run just about 18miles switched to reserve fuel on my return to town so filled up, pushed starter button wouldn’t even turn over, thank god there’s a kick start lever. I came home checked voltage on battery 11.3 volts! Not good. No power whatsoever getting from alternator to battery. I have a suspect rectifier with a slightly fried red/white wire. Question is replace with just rectifier or replace with regulator rectifier. About the same cost wise from what I’ve seen so far.
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Undergoing restoration
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline Bryanj

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Re: Cb550k3 Rectifier
« Reply #1 on: June 28, 2020, 06:48:40 PM »
Im old school and prefer original to this new fangled electonickery.
Rectifiers rately go a used one will 80% be OK.

Offline nairb

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Re: Cb550k3 Rectifier
« Reply #2 on: June 28, 2020, 07:11:30 PM »
On my 3 phase Suzuki gt550 I use a rectifier from fleabay  for less than 3 quid.  My 550K3 still has the original rectifier so I have not had to change it but it has the same wiring as the suzuki.  3 yellow 1 green and the Red/white?.  Well the suzuki is just red.  I have these fitted to all of the suzuki bikes and in 10 or so years not one has failed. 

Its been a very cheap option.  Fleabay item search Sql35a

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« Last Edit: June 28, 2020, 08:11:39 PM by nairb »
cb550k3, cl450k5, re5m, xs650xs2, mt500, kettle, gt550 x2,  gt380 Kz750 twin cb360K0

Offline Johnny4428

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Re: Cb550k3 Rectifier
« Reply #3 on: June 28, 2020, 07:33:08 PM »
Thanks very much guys, that rectifier looks very interesting, anybody else tried one? I think at that sort of money you can’t go wrong. Seen a couple on dk spares but everything advertised 39.99 postage and they don’t use Royal Mail which is cheapest for sending to Orkney, especially something that can be slipped into a small Jiffy bag.
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Undergoing restoration
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline cliff7

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Re: Cb550k3 Rectifier
« Reply #4 on: June 28, 2020, 08:32:05 PM »
I fitted a similar one only a 50A one as it had built in heat sink fins (about a fiver) to a CB400F and it seems fine so far.

Offline Johnny4428

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Re: Cb550k3 Rectifier
« Reply #5 on: July 04, 2020, 04:09:37 PM »
Fitted today, all seems fine, too wet for road test but passed garage run testing.
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1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Undergoing restoration
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline K2-K6

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Re: Cb550k3 Rectifier
« Reply #6 on: July 04, 2020, 05:49:10 PM »
Also to add to the discussion pot  http://forums.sohc4.net/index.php/topic,183347.0.html interesting related thread over on the USA sohc site that could be of interest.

Offline SteveD CB500K0

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Cb550k3 Rectifier
« Reply #7 on: July 04, 2020, 07:19:52 PM »
That tie-wrap needs to be black Jonny


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2022 Tiger Sport 660
1971 CB500K0

Offline Johnny4428

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Re: Cb550k3 Rectifier
« Reply #8 on: July 04, 2020, 07:30:38 PM »
Your absolutely right just doesn’t look right! Quick get the side cover on before anybody else notices.😂😂
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Undergoing restoration
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline SteveD CB500K0

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Re: Cb550k3 Rectifier
« Reply #9 on: July 04, 2020, 08:41:21 PM »
Them there’s the white heat shrink…


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2022 Tiger Sport 660
1971 CB500K0

Offline Johnny4428

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Re: Cb550k3 Rectifier
« Reply #10 on: July 04, 2020, 09:21:35 PM »
Thought I did well finding bits and pieces of correct colour wire, unfortunately no green heat shrink. Added to shopping list  along with black cable ties!!
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Undergoing restoration
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline mike the bike

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Re: Cb550k3 Rectifier
« Reply #11 on: July 04, 2020, 09:44:56 PM »
My 400 ground to a halt on the M4 due to a lack of volts.  One of the terminals had broken off the rectitifer  flush with the epoxy potting.  I  sharpened up a screwdriver and chiselled some of the epoxy away from the broken terminal so I was able to solder a new spade onto it.  That was about 7000 miles ago.
Where's that 10mm socket got to?

Offline Johnny4428

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Re: Cb550k3 Rectifier
« Reply #12 on: July 05, 2020, 07:47:55 AM »
Good fix Mike! Was that a similar type rectifier? Wasn’t sure of the durability of these cheapo components. The temptation to spend £4 compared to £60 was overwhelming.😂
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Undergoing restoration
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline mike the bike

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Re: Cb550k3 Rectifier
« Reply #13 on: July 05, 2020, 08:57:23 AM »
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.
Where's that 10mm socket got to?

Offline Johnny4428

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Re: Cb550k3 Rectifier
« Reply #14 on: July 05, 2020, 11:42:44 AM »
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)🤫
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Undergoing restoration
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

 

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