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Especially true for motorcycles of yesteryear. You could always tell Yamaha, Kawasaki, Suzuki and Honda from the sound. This was true even during the 2 stroke era. Suzuki 380 Ram air, the 400 Yam that looked like a Fizzy and the Kawasaki triples (especially the big ones). We won’t mention Honda, who didn’t descend to the 2 stroke madness, or the Big Suzuki flying teakettle.