1997 XT 350. When it says drill out the pilot to # 76... what drill bit size is that? I've learned it is not a #76 drill bit. What does shimming the needles do or create vs. changing the jet sizes? What I was looking at doing is: SuperTrapp ISD2 Race Core Muffler, Wrapped Headers, Pod Filters (Or Swiss Cheese Air Box). Proposed Carb Set up: Primary Main Jet: 135 Pilot Jet: Drill #76 Primary Needle: 2 Shim Washers Secondary Main Jet: 110 or 120? Secondary Needle: 2 Shim Washers Any insight? Setting up for street use.