Hyosung GT125

The GT125 was available in two body styles: a fully faired sports variant (GT125R) and an unfaired naked version (Comet). Both used a 124 cc DOHC V-twin engine based on Suzuki designs, mounted in the same chassis as the larger GT250, which resulted in a relatively high weight for the 125 cc class.^[2] According to Motorcycle News, the shared chassis made the GT125R "way above average for the budget 125cc class" in build quality, although it was heavier than typical 125 cc learner motorcycles.^[2]

It is very common for owners of this motorbike to tune the carburetor with a 'kit up' that usually costs around €100, and supposedly improves the air/gasoline mix situation at every regime, virtually erasing the engine's well-known lack of torque between 6,500 rpm and 10,500 rpm. This is true however, only for models until the year 2006, after which the engine's design was modified to erase this flaw. It is notorious that the problem still arises on the new models, but it can be dealt with by a proper tuning of the poppet valve's backlash every 6,000 kilometres (3,730 mi).