A couple of years ago Truckracer, CH Ignitions, a few others and I had a long discussion about the RCEXL sensors. Except for the odd ignition curve on the A02, we all agree on the issues with the RCEXL sensors, and I could be wrong on that.

Check out CH Ignitions Post #122 at Rcexl sensor problems

That post sums up a lot of the confusion about the sensor timing. The other pages in the thread covers some odd sensor problems.

A few years ago I saw the 'no spark below about 400 rpm' feature on lawn mower ignitions, I'm sure they did that to prevent lawsuits.

I have five of the DLE-35 engines and two of the Syssa engines and my results were always as shown in the chart that I posted. It is possible that all of the A02 sensors that I have tested, over 10 of them, have been bad and that's why they show that odd curve.

I do have one of the RC Extreme Power sensors now on a Syssa engine with an A01 module. I can put it on the A02 module to see what that looks like.

I've been fighting cancer for a couple of years and that has slowed me down a lot, but I'll dig out my ignition test equipment and repeat some of my tests to see what type of curves I get.