I bored it out to .017 inches(which is a #77 drill, I believe). I don't have a full set of these tiny drills now although I have ordered a full set. The main jet looks like a little servo grommet,not a needle, and is on the opposite end of where the throttle barrel goes in. In one of the threads on the WYL carb here at RCU someone posted a link to a diagram of the WYL carb,this was very helpful as I wasn't sure where it was

J