Sold FQ for a year in 1973 between jobs. We have been repeatedly told never to use anything other than real filter cones. Like everyone else, $2.50 for a cone is a bit steep, so I gave it a try. Used them to sweep the concrete floor in my new barn. After about 10 minutes I noticed that the engine lost speed. The engine also overheated. It's time to replace the filter cone. The fine powder I swept was blown right through the cone and clogged the secondary (disc) filter. These engines need a lotβ¦