Yeah what he said. 40 pilot,maybe 45. Start at 1 1/2 turns on the screw. Warm bike up and turn screw in 1/4 turn at a time (keep track of total) until cylinder stumbles then back it out until it stumbles. Split the difference. If it's less than 1 turn not enough pilot,more than 3 too much. Anywhere in between 1 and 3 turns and you're good. That is only for carbs (VM is one) that use an air screw,fuel screw is the opposite. You can tell what kind of screw you have by what side of the slide the screw is on. Air filter side=air. Cylinder/head side=fuel.
Tune from the pilot up to the main. One circuit at a time. Post up the pilot results. Until you have the overall tuning done leave the needle jet/slide cutaway/air jet as is. They appear to be good for a 500CC hole.