In 1987 Honda made 3 TRX250's
The TRX250 - a shaft driven, air cooled, 4 stroke, 2 wheel drive, electric start utility quad
The TRX250R - a 2 stroke, chain drive, liquid cooled sport quad (primarily for racing)
The TRX250X - a 4 stroke, air cooled, chain drive, kick start only sport quad (primarily for trail riding)