John Casey,
On my "AMA approved" JDE 54 engine, which came with a "JDE ECU" (in reality a Wren MW54 engine with FADEC ECU) there are many user adjustable parameters, the most critical being able to EXCEED the 160,000 top RPM if I so foolishly chose to do so, FYI....

How did that pass muster with the AMA powers that be??

Andrew Coholic