v-force

Im working on a deal on a 2007 kfx 700, only mods im aware of is the dual hmf exhaust. The kid dont know much about it but here is the link to the video he sent me on what it is doing. He says his buddy told him it was the valves. Looking to see if anyone may know what is wrong here. The link is...

i have an 04 kfx 700, and im trying to figure out the best mods for trail performance. im not racing or anything, just trying to trick it out strictly for the trails. its got a maroon spring, aftermarket suspension(not sure of the make),,, for the most part thats it. any suggestions will help...

I'm a new member in need! I got rid of my old 400ex and picked up a v-force and i'm not sure why. I thaught that 700cc would be absolutely nuts but i got to say that i was sorely mistaken. The machine is an '04' with about 10 hours on it. I just threw in a Dalton clutch kit and kept my fingers...