hey guys i just bought my kfx400 last weekend, my first quad. i really like it, its completely stock but will probably be adding a mbrp slip on, k&n, jet kit, and drill out the air box. i was wondering what the top speed on these 400's are. i'll probably be on from time to time tryin to trouble shoot. this being my first quad and all. later and have fun ridin

 

Your looking at a top speed of 65-70 mph. I think they tested the KFX 400 at 66 mph.