My 03 WR450 has all the free mods and I just changed the following: Needle from OBEKP #5 to JD Red #5 Main Jet from 145 to 165 Pilot Jet unchanged, 45 Pilot Air Jet unchanged, 70 Starter Jet unchanged, 65 Leak Jet from 70 to 52 fuel screw from 1.5 to 1.75 turns out Exhaust - from uncorked stock to YZ disconnected TPS Before, it had a slight WOT miss. Now it totally hammers, except if I'm cruising at low RPM in 2nd or 3rd gear and then just whack the throttle open. Unless I kick it down it'll bog for a second or two before catching up and hammering again. I'm having a hard time keeping the front wheel down in all other circumstances, I'm really happy with the changes. I'm at sea level and it's about 85 degrees and humid tonight. Should I go back to the #70 leak jet or is it an AP issue. I believe the delay is still at the stock setting, but I don't think the pump squirt isn't hitting the slide. Someone please help.