Chaz,
I am going to get in trouble and say that common sense should rule these decisions. I can’t see any advantage to use a cogged belt for the sonics, etc instead of o rings. An improvement in reliability, yes; to improveperformance, no. I would rather see racing positions due to racing and not due to a fellow compeditor’s mechanical breakdown. That’s my nickel’s worth…
Mike Jansen
Rotax #27d