By the 2008 model year of the Hyosung Comet, its manufacturer – South Korean S&T Motors Co. Ltd. – had four models for the standard motorcycle: the GT250, GT250R, GT650 and GT650R. The manufacturer""s suggested retail prices are $3,399 for the GT250, $3,799 for the GT250R, $5,099 for the GT650 and $6,099 for the GT650R.
The models of the 2008 Hyosung Comet are mainly named after the displacement of their engines: 249 cubic centimeters (cc) for the GT250 series (rounded up to 250) and 647 cc for the GT650 series (rounded up to 650). The ""R"" suffix signifies the more powerful, racing-oriented variants of the GT250 and GT650.
Each 2008 Hyosung Comet has a four-stroke V-twin (two-cylinder) engine, with four intake valves However, the one on the GT250 series generates 27.5 horsepower at 10,250 revolutions per minute (RPM) and 21 pound-feet (lb-ft) at 7,500 RPM, while the one on the GT650 series pumps out 76.4 horsepower at 9,000 RPM and 50.2 lb-ft at 7,000 RPM. Also, the two Mikuni carburetors are larger on the GT650 series: 39 millimeters (mm) as opposed to 26 mm on the GT 250 series.
The engine on the 2008 Hyosung Comet is paired with a five-speed manual transmission. For fuel, each bike has a gas tank that can hold up to 4.5 gallons (17 liters), with a 0.7-gallon (2.5-l) on the GT650 series.
The 2008 Hyosung Comet is available in three color schemes: Black, Mango Yellow, and Red. Although designed primarily as a naked bike, the GT650R version is fully dressed: with full fairing and a rear spoiler in addition to the standard fenders, fork guards and side covers. The two-piece seat on each bike is big enough for two occupants. The digital instrumentation consists of a tachometer, trip odometer, speedometer, temperature warning gauge and fuel level warning light. A clock is added on the GT650 series, with the fuel level warning indicator a gauge instead of a light. Disc brakes are fitted on each of the ""08 Comet""s 17-inch aluminum wheels for superior braking power. Other features on the bike include rearview mirrors, halogen lighting, and under-seat and lockable storage.
The GT650 series generally has smaller physical measurements than the GT250 series. For instance, it has a smaller wheelbase: 56.5 inches (1,435 mm), compared to the GT250""s 56.9 inches (1,445 mm). However, the GT650 variants tend to be heavier. While the GT250 series has a dry weight of 330.7 lbs. (150 kilograms), the GT650 series has a dry weight of 421.1 lbs. (191 kg).