A minor modification to the racing rules….
Four-Star-40-and-UpRoar-Rules-August-10-2022ENGINE TYPE: A .40 to .46 cu. in. two-stroke ringed or non-ringed engine is required. “High Performance” (i.e. Nelson, Jett, etc.) engines will NOT be allowed. No tuned mufflers (with internal pipe) like Nelson, Jett, Super Tiger, etc. allowed. You are allowed to remove the conical baffle in the OS Power Box muffler. Engine must be able to idle and be shut off by radio control.
