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CG125 ignition trigger coil resistance?
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JB
Mar 24, 2014, 5:44:08 AM3/24/14
to
Anyone know what the ignition trigger coil resistance is meant to be on
these (Brazilian varaint)?
cheers,
JB
these (Brazilian varaint)?
cheers,
JB
Mark Olson
Mar 24, 2014, 7:48:18 AM3/24/14
to
Seriously, it's almost certainly going to be something like 100 Ohms or
open. You can actually measure the output pulse with a laptop if you've
a mind to.
Here's the trigger pulse from my EX500: http://i.imgur.com/xi5HcP3.png
JB
Mar 24, 2014, 10:15:58 AM3/24/14
to
"Mark Olson" <ols...@tiny.invalid> wrote in message
news:bpakc4...@mid.individual.net...
The one on my CG is measuring ~10Ohms so I'm assuming this one is dead due
to turn to turn short.
Just wanted to make sure Honda hadn't designed some obscure pickup coil spec
before ordering a new one.
JB
Mark Olson
Mar 24, 2014, 11:06:08 AM3/24/14
to
I'd order a replacement on the strength of that measurement.
Jordan
Mar 24, 2014, 4:58:01 PM3/24/14
to
On 24/03/2014 10:48 PM, Mark Olson wrote:
>
> Here's the trigger pulse from my EX500: http://i.imgur.com/xi5HcP3.png
>
>
Interesting, thanks.
>
> Here's the trigger pulse from my EX500: http://i.imgur.com/xi5HcP3.png
>
>
That's done with your microphone input?
Any extra hardware needed?
Are the scale readings on the left side meaningful?
Mark Olson
Mar 24, 2014, 10:20:44 PM3/24/14
to
[crossposted to ukrm]
On 03/24/2014 03:58 PM, Jordan wrote:
> On 24/03/2014 10:48 PM, Mark Olson wrote:
>
>>
>> Here's the trigger pulse from my EX500: http://i.imgur.com/xi5HcP3.png
>>
>>
>
> Interesting, thanks.
> That's done with your microphone input?
Line level input.
> Any extra hardware needed?
Voltage dividers to bring the trigger coil and primary circuit voltages
down to something reasonable for the line in:
http://imgur.com/a/ZVnGp#1
> Are the scale readings on the left side meaningful?
It's probably the voltage seen at the sound card input but I wasn't
concerned with measuring the true voltage so much as looking at
timing relationships.
It was an interesting problem, I bought a 1995 EX500 for my son to
learn on. It pulled strong, and seemed a little vibey, but not too
bad at first glance. But after commuting on it a couple of weeks,
I came to the conclusion it was vibrating too much.
While trying to pin down the source of the vibration, I discovered
that one cylinder's ignition timing was about 6 degrees advanced
compared to the other, yet there's only one pickup coil on the 2nd
generation EX500, and it's triggered by a couple of raised strips of
metal on the periphery of the rotor. I carefully measured the angular
position of the edges of the strips, and even measured their height
using a depth gauge.
You can see that the trigger pulse for each cylinder is very similar
in shape, yet one cylinder is triggering on the rising edge of the
pulse (that's the problematic one) and one's triggering correctly on
the falling edge.
To my mind, there's no logical reason why the threshold for triggering
the ignition module should be different for #1 and #2 cylinder, unless
the module is actually switching between two different threshold
detector circuits with an analog switch, when switching from one
cylinder to the other. I would have used the same analog front end
and just did the back and forth switching in the digital domain,
but KHI had their own ideas.
But in the end it didn't matter, a replacement IC Igniter from ebay
fixed the issue.
The engine still vibrated like a bastard unfortunately so another
lump was procured which finally banished the tooth-rattling vibes.
On 03/24/2014 03:58 PM, Jordan wrote:
> On 24/03/2014 10:48 PM, Mark Olson wrote:
>
>>
>> Here's the trigger pulse from my EX500: http://i.imgur.com/xi5HcP3.png
>>
>>
>
> Interesting, thanks.
> That's done with your microphone input?
> Any extra hardware needed?
Voltage dividers to bring the trigger coil and primary circuit voltages
down to something reasonable for the line in:
http://imgur.com/a/ZVnGp#1
> Are the scale readings on the left side meaningful?
concerned with measuring the true voltage so much as looking at
timing relationships.
It was an interesting problem, I bought a 1995 EX500 for my son to
learn on. It pulled strong, and seemed a little vibey, but not too
bad at first glance. But after commuting on it a couple of weeks,
I came to the conclusion it was vibrating too much.
While trying to pin down the source of the vibration, I discovered
that one cylinder's ignition timing was about 6 degrees advanced
compared to the other, yet there's only one pickup coil on the 2nd
generation EX500, and it's triggered by a couple of raised strips of
metal on the periphery of the rotor. I carefully measured the angular
position of the edges of the strips, and even measured their height
using a depth gauge.
You can see that the trigger pulse for each cylinder is very similar
in shape, yet one cylinder is triggering on the rising edge of the
pulse (that's the problematic one) and one's triggering correctly on
the falling edge.
To my mind, there's no logical reason why the threshold for triggering
the ignition module should be different for #1 and #2 cylinder, unless
the module is actually switching between two different threshold
detector circuits with an analog switch, when switching from one
cylinder to the other. I would have used the same analog front end
and just did the back and forth switching in the digital domain,
but KHI had their own ideas.
But in the end it didn't matter, a replacement IC Igniter from ebay
fixed the issue.
The engine still vibrated like a bastard unfortunately so another
lump was procured which finally banished the tooth-rattling vibes.
Jordan
Mar 27, 2014, 5:11:15 AM3/27/14
to
On 25/03/2014 1:20 PM, Mark Olson wrote:
> [crossposted to ukrm]
>
> On 03/24/2014 03:58 PM, Jordan wrote:
>
>> Any extra hardware needed?
>
> Voltage dividers to bring the trigger coil and primary circuit voltages
> down to something reasonable for the line in:
>
> http://imgur.com/a/ZVnGp#1
>
>
> [crossposted to ukrm]
>
> On 03/24/2014 03:58 PM, Jordan wrote:
>
>> Any extra hardware needed?
>
> Voltage dividers to bring the trigger coil and primary circuit voltages
> down to something reasonable for the line in:
>
> http://imgur.com/a/ZVnGp#1
>
>
> The engine still vibrated like a bastard unfortunately so another
> lump was procured which finally banished the tooth-rattling vibes.
>
Thanks for that.
> lump was procured which finally banished the tooth-rattling vibes.
>
What's another lump?
Mark Olson
Mar 27, 2014, 7:47:44 AM3/27/14
to
Eiron
Mar 27, 2014, 7:49:43 AM3/27/14
to
--
Eiron.
Jordan
Mar 27, 2014, 5:39:54 PM3/27/14
to
Was it a replacement engine?
Mark Olson
Mar 27, 2014, 6:52:55 PM3/27/14
to
Ace
Mar 30, 2014, 2:36:40 AM3/30/14
to
On Thu, 27 Mar 2014 11:49:43 +0000, Eiron <Evelyn....@live.com>
wrote:
Too subtle, especially for the septics, who've probably never heard of
her (and are better off for it).
wrote:
her (and are better off for it).
davethedave
Mar 30, 2014, 4:22:13 AM3/30/14
to
On Sun, 30 Mar 2014 08:36:40 +0200, Ace wrote:
>>>> What's another lump?
>>>
>>> About $400 plus freight.
>>
>>I would have thought Jordan was an expert on lumps.
>
> Too subtle, especially for the septics, who've probably never heard of
> her (and are better off for it).
Everybody wants to be like Mike?
>>>> What's another lump?
>>>
>>> About $400 plus freight.
>>
>>I would have thought Jordan was an expert on lumps.
>
> Too subtle, especially for the septics, who've probably never heard of
> her (and are better off for it).
--
davethedave
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