Originally Posted by
cathurga
Apologies for not contributing to the original topic, but I have an interest in the ignition curves. Does anyone have anymore information on what the ACTUAL curves look like between the AO1 and AO2 modules?
Sorry to the OP, if you want me to create a new thread, I would happily oblige.
Regards
Andy
Yes, I've done a lot of testing on the ignition modules over the years.
There are a lot of differences between the A01 and A02. They are not interchangeable on all engines. I found that some of the old 50cc engines that had the A01 modules will not run well with the A02 modules.
One change that was made that has caused some problems, when a 4.8 vdc ignition battery was used, is that when they increased the upper voltage limit, the lower limit was also increased. The new A02 modules may not work with voltages below 4.6 vdc.
It's interesting to note that, at low rpms, the A02 modules are firing after top dead center. When I first mapped out the ignition curve on the A02, I thought the module was defective. That's not normal for most engines, but it can eliminate some low idle problems.
Attached are my test results for two modules. Virtually every module I've tested, that produced a spark, over the years have followed these results very closely.