Some friendly feedback, please dont take this the wrong way.
"four banger" typically refers to a 4 cylinder engine. The Saito 82 is a single cylinder engine. So if you want to use the term "banger" correctly it is a one banger.
By saying "four banger" I assume you are refering to the number of strokes the engine makes for each power (bang) stroke, which you are correct. They are strokes not bangs tho.