your pilot jet is underneath the carb, inside the carb bowl area. You'll need to remove (or at least unhook from airbox and intake and flip over)
your carb, remove the 4 screws holding on the carb bowl and your pilot and main jets will be visible. I've circled the place where the 2 jets go in my pic and also circled the pilot jet off to the side in the white lid. (the jets are removed by unscrewing them with a slotted screwdriver, be careful, the jets are made of soft brass)
Tons of videos on cleaning carbs on youtube. Search 'cleaning GY6 carb' and you'll get lots of hits.