The carb in an '06 WR450 has more jets than I'm used to
In a 'traditional' carb you have:
Needle / Needle Jet
Pilot air screw
In addition to the above, it seems this carb has
1) A 'Leak' jet that seems to tie in with the accelerator pump
2) It has a Pilot Jet & a Pilot Air Jet.....and no adjustable 'pilot air screw'
so the air screw is replaced with a fixed orrifice or jet
Is this all correct?