The problem with the "second" rev limit at 8100 has to do with coil saturation. With a wasted spark system, (only way to run a 2 cylinder 4 stroke with a single crank position sensor) these engines spark twice as often as the 360 version. The T100 ignition will do the same thing at 16200.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python