Ok, I did some checking in the 028 parts bin. the extra flywheel that I have came off an old points version 028 (3 hole recoil) I converted that saw to electronic ignition when I got it, It was suffering from some kind of ign. break down at high RPM, and it came with a spare electronic coil and matching flywheel.
Now I have read about and experenced a few degrees of timing advance when adding an electronic control module to older point equipped saws.
This I read was due to the electronic igns. faster reaction time.
Last weekend I swapped the flywheels on it, so it now has the original "points" flywheel.
It started right up and seemed to respond exactly the same as it did with the other flywheel.
The flywheels had different part# , but both had "SEM" and "Bosch" embossed on them.
All this got me thinking, there isn't any rocket science behind the basics of how a ignition system works. the coil doesn't know part #s, it just knows that
a magnetic field passed by the primary side windings, and generated a small amount of current. The electronic portion of a coil is basically just a transistorized switch. (timing curves and rev limiting not included, but would happen after the primary current was induced)
Being that the coils on all 028 were mounted in the same relationship to TDC, it shouldn't matter more that a few degrees what coil it is. Weather or now it would run optimally is another question, even that could be solved my hand timing it with no key or using an offset key.
Let me know if I'm way off base with the above paragraph.
I have a couple late 028 Supers, I will do some more swapping of ignition components and see what happens.
Jim
