ORIGINAL: w8ye
They sound just like a 60 size two stroke with a pitts muffler. The engine runs just a little slower.
They do not sound like four strokes.
To me, and everyone's perception is unique unto themselves, The big bore glow two-strokes have a deep, throaty sound that is quite unique and pleasing. The bass tones are louder because of the increased displacement. The high-pitched, ringy-dingy sounds of significantly smaller glow two-strokes are not as noticable. The large glow engines have a "manly" sound to me. But that is with my hearing. Your hearing most certainly will be different from mine.
Ed Cregger