Not sure how heavy the air launched YJ83 is. Will assume roughly 600 kg.
So 4 YJ83 missiles. 4 heavy pylons.
4 pl12 missiles. 4 AAM pylons
and i'll also assume 2 pl-8 missiles. 2 wingtip pylons.
Usually a missile launch rail weighs 25-40 kg, but to that one must add the pylon (unless its the wingtip launcher) which for US wing pylons seems to be 50 to 90 kg, if i am not mistaken.
So 4 missiles times 600 kg.
4 heavy pylons times 90 kg
4 MRAAMs times 200 kg.
4 lighter plyons and launch rails times 90 kg
2 SRAAMs times 100 kg
2 wingtip rails times 25 kg.
Total of 4170 kg. Without pilot, his equipment, gun ammo, chaff/flares, oil.
Pilot and equipment 100-ish kg? Gun ammo 75 kg if 0.5 kg per round for 150 rounds? USAF decoy boxes are usually 20-ish kg per box and another 0.2 kg per each decoy. F15 carries some 38 liters of oil.
So possibly just over 4450 kg altogether. Without empty plane weight and without fuel.