Лучше бы в полном контексте для полного понимания , а так
двигатель объемом (от) 0.6 до 0.91 кубических дюймов, двухтактный. ( Двигатели ОС так и маркируются, например O.S. .61 FX).
Что значит: .60 to .91 cu. in. 2-stroke
Скачай в разделе "справочник"эти полезные таблички и всё станет понятно www.hobby.sky.net.ua . А .60 to .91 cu. in. 2-stroke, обычно означает что допускается установка 2х тактного мотора объёмом от 10 до 14,9 см. куб.
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