From: Richard Prosser <rhprosser@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Mon, 2 Aug 2021 00:52:18 -0700
Subject: Re: [EE] Honda M250 ignition waveforms
Thread-Topic: [EE] Honda M250 ignition waveforms
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I think the voltages (when points connected) are way too small.  Is there a
capacitor (condenser) across the points? it could be broken. Otherwise
there may be another leakage path across the points.  (low oil shut off or
ignition key??)
I was going to  suggest that the series resistance in the secondary side
could be high, but the voltage with the points (and ?) disconnected look to
be pretty much as I'd expect. I'd expect to see some ringing as well and
maybe >150V peak if all was going well.
Have you got something else you can compare it to? - even a motor mower
might give you a clue as to what to expect.
RP


On Mon, 2 Aug 2021 at 14:03, Harold Hallikainen <harold@mai.hallikainen.org=
>
wrote:

> Thanks for the comments thus far. I've attached some waveforms. I had to
> break this into separate emails to stay under the 60 kB limit.
>
> TEK00002 - Edited.png - This is with the ignition coil primary
> disconnected. It is the magneto output with breaker points operating. Pea=
k
> voltage is about 40V.
>
>
> Does anyone have any idea of expected waveforms?
>
> Thanks!
>
> Harold
>
>
>
>
>
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