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I was told today that the 1L 3cyl Metro motor was originally used in a snowmobile with a CVT transmission. I don't know how reliable that information is.
I have no doubt it has been used in a snowmobile. It's also popular as an aircraft engine. But Suzuki introduced it in the early 1980s for a Japanese market called "Kei class", which were 600cc cars that met specific size and weight limits, among other things. Kei cars were popular in Japan because licensing, registration, and insurance were substantially lower than for larger cars.
Foreign-market engines were mostly the 1000cc G10 variant. Cylinder heads changed from rocker arms to shim-and-bucket, and some four cylinder variants had four valves per cylinder, but the 600cc version was almost unknown until Caterham snapped up some inventory they found in Japan, a 600cc turbo variant for some kind of light delivery vehicle. Caterham built 160s until they ran out of engines.
I'm somewhat surprised they didn't buy reman 1000cc engines to continue the 160 line, which had a long waiting list, but emissions certification might have been an issue, and some places go by the serial number stamped in the engine block, now matter what specs it was rebuilt to.