Thank you Dave and Steve you saved me a lot of typing! In any competitive event the participants will push for any perceived advantage to the limit of the rules. We have seen displacement grow from .60 to 1.20, 1,40, 1.60 1.70 and now 1.85 with CDI and several versions of more complex soft mounts all at higher cost and complexity. And no one will compete with just one engine. We have also seen simple brush-less motors grow to complex gear or belt drives and even counter rotating systems.
It is counter intuitive but fewer limits gives more room to increase cost and complexity. Rules are part of any competition and one must always be keenly aware of the unintended consequences of changes.