The top speed of a Yamaha Warrior 350 can vary depending on factors such as rider weight, terrain, and modifications. However, in its stock configuration, the Yamaha Warrior 350 is capable of reaching a top speed of approximately 55-60 miles per hour (88-96 kilometers per hour). It's worth noting that this is an estimate, and actual speeds may differ slightly. Additionally, modifications to the ATV, such as aftermarket parts or gearing changes, can potentially increase or decrease its top speed.