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Author Topic: CB 500 rectifier?  (Read 1749 times)

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ROSKO

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CB 500 rectifier?
« on: September 20, 2005, 10:36:42 am »
Just wondering, is a CB 500 recdtifier the same as the ones used on the (350/450)twins?
« Last Edit: December 23, 2006, 08:17:59 pm by Glenn Stauffer »
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Offline sidematic

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Re: CB 500 rectifier?
« Reply #1 on: September 20, 2005, 11:31:15 am »
contact oregonmotorcycleparts.com  He is very knowledgeable and will be able to provide with the part you need.
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Offline TwoTired

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Re: CB 500 rectifier?
« Reply #2 on: September 20, 2005, 01:44:34 pm »
If you are trying to put the one in the picture on a CB500, then I'd say no.
You need a three phase rectifier.  Connector has six positions with one position unoccupied.  Three wires from the alternator and two to the bikes system; +12V, and 12v return.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Paul

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Re: CB 500 rectifier?
« Reply #3 on: September 20, 2005, 02:07:44 pm »
You don't say where you are from, but I had a bad rectifier on my 500 and I replaced it with with a new solid state one from
Farnell (www.farnellinone.....) or their other company in the US ..Newark. (The company ....not the place)
I got a new rectifier and heat sink for around $8.
Some say go with original but I recon if the new type were around when these bikes were being built they could have used these.
If you are stuck, let me know and I can get the part No's for you.
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Paul.
It hurts to admit when you've made mistakes, But when the're big enough, the pain only lasts a second

ROSKO

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Re: CB 500 rectifier?
« Reply #4 on: September 20, 2005, 07:49:46 pm »
Thanks. I run oregon rectifiers on all my bikes, great stuff. I was asking because my buddy needed a new rectifier and I thought I'd pass an old one on for a temporary fix. It is 12/ 12 and six wire w/ one unoccupied... Just a thought.
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Offline TwoTired

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Re: CB 500 rectifier?
« Reply #5 on: September 21, 2005, 12:18:12 am »
It will probably work, then.  Just make sure the connector positions are correct.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline bryanj

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Re: CB 500 rectifier?
« Reply #6 on: September 21, 2005, 01:09:13 am »
NOPE a twin one will not work but any four one will including the dohc ones which have a built in electronic reg, you just need to know which wire goes where and somwhere i have a diagram
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline oldbiker

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Re: CB 500 rectifier?
« Reply #7 on: September 21, 2005, 02:27:45 am »
Rosko, the rectifier shown in your post is an old Selenium rectifier which is not very efficient. You must go for a modern Silicon rectifier. As other answers said, there are plenty of options open to you. Oregon is one that is highly recommended.
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bike54

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Re: CB 500 rectifier?
« Reply #8 on: September 21, 2005, 05:10:02 am »
hi all
a little tip about old Selenium rectifiers easy to tell when they are faulty you dont even need a meter just smell it it will smell of rotten fish when faulty personaly when i come across them i automatically change them for a modern bridge rectifier (silicon)

merv  :)
« Last Edit: September 21, 2005, 05:12:18 am by bike54 »
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