That depends on a few things, the weight the bike is carrying, the type of terrain the bike is on, and most importantly the gearing, the smaller the front sprocket an the larger the rear sprocket the more torque you have, but you will slow your top speed, conversely speaking, the larger the front sprocket, and the smaller the rear sprocket your top speed will increase, but you will be slower off the line, a general rule of thumb is: thick, deep, heavy, muddy soil you go with the "Torque gearing", hard packed you go with the smaller rear gear an larger front gear. How fast will the 450 go, it depends on these factors and the tune-up.
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depends on your weight,if your about 60-100 you will probaly go about 60.if your more about 50-0