Enjoyed reading your post on Alice, I just completely tore down one of the Hahn 524's I bought off of CL. I bought some books and took apart the 5 hp Briggs, the valves look like they need to be lapped and I put a solid state ignition on it when I first got it and it leaked,found out that there was a double gasket on the muffler. I was in the process of getting all the paint and rust off the engine parts and blower but I tore my bicep tendon at work so project will be on hold for a while. I saw you put gorilla snot on the sump and Permatex copper spray on head gasket, but was wondering if any sealant should be put on the other gaskets (muffler,intake,and breather cover) appreciate any advice you could give me. I'm glad I have 2 so I can look at the second one to help me build this one. I never did this type of work,bought some books off a eBay. Thanks Ken