GREETINGS! I have a question for all you yz pros! I recently purchased a 2007 yz450f. The past two bikes I have owned were 2004 CRF450's. I love the bike, but it seems as if the back wheel is too quick to break free in the top-end, almost like a two-stroke. I happen to work at a Yamaha dealership, so I asked one of our techs, and he said going up in the rear (meaning gearing DOWN) would only make it worse. Tires are fine. Any ideas or suggestions? Also, the engine makes a funny noise when the clutch lever is out, but sounds completely normal while holding the lever in. My tech said this is normal. Any help would be GREATLY appreciated! THANK YOU!