Got a few questions regarding jetting for my 08 YZ-450F. Just picked it up from the dealer last week and took it out this weekend. Very happy with the power and suspension. I finally made the switch to a four stroke from an 03 YZ-250 and it's definitely a different riding experience. I typically ride in areas of the so cal desert that range from 2800-3200 Feet and the bike has stock jetting. I have looked at the jetting thread and did not really find anyone with settings set up for the so cal desert or these altitudes. The bike seems to have a little bit of a bog off the bottom and slight pop on decel. I have done some research and went ahead and ordered a fuel screw from Zip-Ty. From what I have read it seems that a little fuel screw adjustment will clean up the bottom bog...any input? Being my first 4-stroke I do not really have any prior experience to judge how cleanly my bike is jetting. If anyone has some experience at these altitudes with so cal desert weather, It would really help out. Only engine mod so far is a PMB spark arrester insert. Ordered a Clarke 2.6 (like the 2.6 compared to the added bulk of an IMS 3.1), a GPR stab., a GYTR flywheel, GYTR skid plate, and some handguards. Should be a pretty good desert sled after that.