912 CDI (SMD) Failures

Wayne, that's interesting. I thought that the 12V battery powered DC-DC converter on the Ignitech modules was only used when the starter was engaged. I didn't realise that they were fitted with a switch so that you could choose to power them up.

It sounds like one of the modules couldn't be powered from the AC voltage provided by the Rotax coils for some reason whereas the DC from the converter worked OK.

I would swap the connectors to the two modules and then if it happens again but the problem has moved to the other ignition then you know that it is a problem with that module and you can get it repaired or replaced.

What we found during measurements on the test bench to test different advance curves on the Ignitech modules is that the modules are supplied with 12V from the on-board battery, then, when the Rotax generator supplied its energy, it blocks the operation of the battery and then powers the ignition modules.

In our assembly, there is no switch, it is the highest voltage which takes priority.

In the event of a malfunction of the Rotax generator, the battery then does its job automatically to power the modules.

This function is fulfilled by the small white boxes of the photo that I published.

Jacques

Ya i dont know i ordered a couple of analog ac voltage gauges today to hook them into the stator wires to watch for voltage fluctuations along the way a lot of people over here that i know run with the same setup as mine and don't have any issues so I'm leaning towards a stator problem just going to do a little more checking before i spend a thousand bucks on a stator

I would be surprised if there was a problem with the stator, at the end of the day it is just a coil of wire. I would have thought that it is more likely that the AC input on the ignition module has a problem.

I would swap the modules over so that if it happens again and the fault is now on the other side then you know it is not the stator.

An idle thought;

If the problems with the Rotax modules service longevity are heat & vibration, why not just relocate the modules just like the Ignitech units?

I presume that all that would be required is a "loom" extension. Rotax could easily offer  a number of lengths to choose from, so that the modules could be relocated from over the crankcase, to a lower heat/vibration environment.