- 1986 Yamaha YX600S Radian
- 1987 Yamaha YX600T Radian
- 1988 Yamaha YX600U Radian
- 1989 Yamaha YX600W Radian
- 1990 Yamaha YX600A Radian
Engine: 59 cc, 36.55 cubic inches, In-line four, four-stroke, 52.4 HP (38.3 kW)) @ 9000 RPM, 35.6 Nm (3.6 kgf-m or 26.3 ft.lbs) @ 7500 RPM, 10.0:1, 58.5 x 55.7 mm (2.3 x 2.2 inches), 2 valves per cylinder, air cooled, Double Overhead Cams/Twin Cam (DOHC).
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