Author Topic: CX500 CDI  (Read 1895 times)

Offline RGP750

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CX500 CDI
« on: August 18, 2017, 02:40:23 PM »
Hi All
Anyone know symptoms of faulty CDI on cx500?
Anyone have one they know is good i can borrow for a couple of days just to prove that is what it wrong? .
Modern replacement coming in at £200 from Australia so god knows what final bill would end up .
Rich :(
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline Trigger

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Re: CX500 CDI
« Reply #1 on: August 18, 2017, 02:59:47 PM »
First, there is a black wire with white stripe under the seat near the CDI, unplug it and see if that makes any difference. Is the bike having problems reving past 4500? The problem with the CDI is that it shows the same problem as the alternator. Get woodside to lend you his but, if it is still having problems then it is the alternator.

Offline RGP750

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Re: CX500 CDI
« Reply #2 on: August 18, 2017, 03:10:40 PM »
Thanks Trigg
Only on the left side.
stripped carbs several times ,they seem ok
swapped coils ,same problem .
swapped plugs same.
exhaust is getting warm but no where as hot as right side
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline RGP750

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Re: CX500 CDI
« Reply #3 on: August 18, 2017, 03:23:46 PM »
Disconnected wire ,no difference.
at about 4500 spitting in exhaust.
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline Woodside

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Re: CX500 CDI
« Reply #4 on: August 18, 2017, 05:00:00 PM »
Tis true i do have one ..if needs be..
But it wont be available for about a month..
Im off for abit then its in for its mot 9th sept..
So it will be needed im afraid ...
Also i do have a 500 air filter spring if you need one to copy...as i could do with an extra one too...
Let me know if you can wait

Offline Bryanj

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Re: CX500 CDI
« Reply #5 on: August 18, 2017, 05:34:08 PM »
I remember there being a testing page in the Honda manual but you had to use a specific make and type of meter or the readings didn't work. I had a correct meter bought in Yokohama in 75 when dry docking a tanker, turned out to be the right one! Sanwa SP10D if memory serves

Offline RGP750

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Re: CX500 CDI
« Reply #6 on: August 18, 2017, 05:36:46 PM »
That would be great if i could borrow it for a couple of hours to try.
it will at least prove the point.
No hurry September is fine thanks and nothing like having an original to copy.
You can have one FOC when i get them done.
I love this forum :D :D
Rich
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline RGP750

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Re: CX500 CDI
« Reply #7 on: August 18, 2017, 05:38:54 PM »
Hi Bryan I have that page but i think it is a page for Ashimoto, Electrics not my passion  ::)
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline Woodside

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Re: CX500 CDI
« Reply #8 on: August 18, 2017, 06:04:21 PM »
When its mot'd i may pop up on it....if we screw it up ill need to borrow the k0 to get home! ;D

Offline RGP750

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Re: CX500 CDI
« Reply #9 on: August 18, 2017, 06:27:36 PM »
 ;D ;D ;D ;D ;D Of course you can
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline AshimotoK0

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Re: CX500 CDI
« Reply #10 on: August 18, 2017, 10:25:23 PM »
I have one on my 300 miler Rich (don't listen to any doubters on here ...it is indeed a 300 miler). Not run the bike yet but you are welcome to try the CDi  if you wish or any other readily removable parts. I could send it with the 175 carbs you sent me to US clean. You are welcome to try the carbs too if you wish as they are already off the bike and the cleanest set of carbs inside I have ever seen on a bike. It's a 500B model ('82)

I can also suss out how to test if you wish .. I have lots of test gear inc oscilloscopes etc.. I remember depotting a failed CB400N CDi back in the day and found the discharge capacitor to be at fault, if I remember correctly.

BTW you include faaaaaar too much return postage  in with those carbs .... most of it will be coming back  ;D ;D
« Last Edit: August 18, 2017, 10:37:30 PM by AshimotoK0 »
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Offline RGP750

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Re: CX500 CDI
« Reply #11 on: August 19, 2017, 06:51:59 AM »
Thanks Ash
I' ll do a bit of research to see if there is any difference between cxA and B's (i think mine is A).
It would save Woodside the grief.
I'll copy the test page re checking one, all Gobbeldegook to me but i'm sure you will understand it.
Please keep the postage especially if you can send me the carbs/ CDI. from your cx.
The guy working for me is pushing me to ride it this year , tells me i will love it and won't want to ride that" K0 thing"  ;D
Rich
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline Trigger

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Re: CX500 CDI
« Reply #12 on: August 19, 2017, 07:52:09 AM »
Welcome to the mad world of the CX CDI  ;D
I will message you Rich on what you need to do.

A and B run the same electrics, but I thought you had a CX500Z ?
« Last Edit: August 19, 2017, 07:54:57 AM by Trigger »

Offline RGP750

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Re: CX500 CDI
« Reply #13 on: August 19, 2017, 08:54:47 AM »
what z1
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline Trigger

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Re: CX500 CDI
« Reply #14 on: August 19, 2017, 09:05:38 AM »
what z1

The first CX was Z= Zero, then the A, then the B, then the C=Custom ;) and so on.

 

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