Ok I was wondering if a leak jet will solve my issue... I posted this in the Jetting section but haven't got any replies yet. I figured Id you fellas: Here is the good stuff. 2002 Yamaha YZ426f 2200'/70*/No Humidity Issues ~40% All year/Desert, Dunes, Trails HMF Competition Stage 2 (flows a little more air then stock)/ No air box lid, With No Toil filter W backfire screen/ nothing to the motor Ive done the " O Ring Mod" Current Jetting: Main: 162 (stock) Pilot: 42 (stock) Starter: I think 72 but that shouldnt be my problem, it starts like a dream. Needle: OBEJP 4th clip Issue: I just have bog in the low. Rolling in 2nd gear to full throttle immediate bog then clears up when the fuel burns off, Happens everytime all the time. Im new to 450's so I dont know what to change first! I can do all adjustments and change jets that no big deal I just dont know anyone that has alot of knowledge on these bikes! Motor is 100% sound valves checked perfect, im positive of all that. Im wondering if the addition of a leak jet might be the solution? Thanks Guys!