I'm sorry I didn"t explain thoroughly enough. I never installed the seal it came out in between the two inspections and I had only ran it for just a few minutes between those times I ck. it. I never messed w/ the seal. I just bought the quad a few months ago. And there were no backfires while starting. I'm lucky I went back in to install the stator or I would have possibly froze up the engine! Any idea what caused the seal to blow out.