The top speed of a Royal Enfield Bullet 350 is typically around 70-80 kilometers per hour (43-50 miles per hour). However, it's important to note that Royal Enfield motorcycles, including the Bullet 350, are not designed for high-speed performance. They are more suited for relaxed cruising and enjoying the journey rather than chasing top speeds. The Bullet 350 is known for its low-end torque and ability to handle well at lower speeds, making it a popular choice for city riding and leisurely touring.