Just got rid of a 2008 450F and had it dialed in perfectly for my elevation 100' and ambient temperature. Just bought a brand new 2007 450f off a guy who bought it, rode for like 5 minutes, scared himself and parked it for the last 3 years. I completely disassembled the carb, cleaned it, and put it all back together. This is my first time doing a 4 stroke carb, but I know that it is back together properly. I followed the manual and triple checked everything. I have all the stock jets in there and the pilot screw is set to 1.5 turns out. When I wick the throttle on with no load, the motor hesitates and then comes on. The air filter barely has any oil on it, as the oil that is there is still the stuff from the factory and it's three years old and barely existent. Any ideas to help me? Thank you.