Originally Posted by YardApeMike
This is a Stens Inner Air Filter (pn 100-780) off a B&S Vanguard 61000 with 180 hrs since last change. The filter media appears to be melted, causing the holes. Outer filter is intact. I have 3 engines and a Kohler ECV749 with the same problem. Any ideas what might cause this?
not just any backfire the queen mother of all backfires
Don't cut your engine right after you runing full trottle
Let it idle for a short time