I have 2 non running generators. The first is a Predator 6500 bought in 2017. Backfires during starts and then dies. I was told it needs a valve adjustment?? The other is a 2022 Generac 3300 that I believe has carburetor issues, hard to start then stalls out?? I don't have the time or skills to fix either. I'm asking $50 each or $90 for both. Call or text show contact info