Originally Posted by supershaft
They do have bob weights in the advance. You can limit or extend the weights' travel with the weight stops thusly changing the advance range in degrees and then you can alter the weight's weight and extend or reduce the curve in relation to the rpm. The weight stops bend back and forth without breaking very easily. I have done it dozens of times.
I played around with the mapping of my ignition but only enough to replace the Boyer and its creeping advance.
The Ignitech is nice bit of kit, comes with rev limiter and you can adjust the curve with the motor running.
Would work a treat on a road bike.