Don't show this message again
§ 86.419-2006 Engine displacement, motorcycle classes.
(a)
(1) Engine displacement shall be calculated using nominal engine values and rounded to the nearest whole cubic centimeter.
(2) For rotary engines, displacement means the maximum volume of a combustion chamber between two rotor tip seals, minus the minimum volume of the combustion chamber between those two rotor tip seals, times three times the number of rotors, according to the following formula: