1st- slap the PO. An SOHC/4 is NOT meant to carry sacks of sh*... wait... well, anyway...
2) yeah, get new carbs... OR in a real pinch (like if you're really broke) clean them really well and touch up the edges with a small jeweler's file. Maybe fill in some pitting with JB weld, then file smooth. The only permanent and optimal solution is new carbs, but we're all hurting in our wallets, and the above might buy you a month or two or just a chance to get the bike started.