View Single Post
Old 03-17-2010, 08:17 PM
AussieSteve's Avatar
AussieSteve AussieSteve is offline
Motorized Bicycle Senior Member
Join Date: Nov 2009
Location: Nowra, NSW, Australia
Posts: 77
Default Re: ignition timing adjustment methods

I came to a similar conclusion regarding the 'firing point', hence the 'stepped' rotor.
I have an oscilloscope, but have never bothered to take a look at the waveform. It would be interesting, those steps on the rotor would give a stepped output voltage.
My 'scope is a dual-trace, so I could observe both the magneto output and the HT lead to see exactly which point on the waveform the engine fires at.
If battery power is available, signal processing of the original waveform to modify it's shape followed by an output driver to drive the CDI is another potential method of obtaining varying advance with rpm.

Earlier, I shouldn't have said it's impossible to do this, but I really meant that it was impossible with the original system.
... Steve

Last edited by AussieSteve; 03-17-2010 at 08:23 PM.
Reply With Quote