A late uncle in Saskatchewan gave me my AH-47 when I was a young teen as it didn’t have enough power to run a grain auger. After returning home from our holiday trip that year, I took the Briggs off our reel mower and adapted the AH-47 to it. This was probably when I lost the air filter as the governor parts were removed to and misplaced (disposed of) around the same time. Growing up near a speedway, I learned early on that an engine needs to breathe and rev high to win races. See the connection? Anyway, when I got the AH-47 mounted on the mower, I had a string hooked to the carb for a throttle control and after filling the tank with gas, I got the motor started and made it about 50 feet before it promptly blew up. I didn’t know they needed oil mixed in with the gas and the aluminum rod grabbed the crankshaft and shattered, something like a 5.5 or 7.5 horse Johnnyrude will do if run hard on anything other than 16:1 mix.
A few years ago I found a rough AV-47 at a flea market for five bucks and sure enough, the piston, rod, and reed valve were the same as the ones used in the old broken and archived AH-47. After swapping the parts in, it is now a 16:1 fuel drinking and running motor again sitting on a shelf waiting for a governor and air filter to be complete again.
As for the muffler, it’s just an aluminum cast cover which screws onto the cylinder and has a few holes in it. It doesn’t really muffle any sound as there are no baffles in it and you can see the exhaust ports and fire coming out when you look at it while the motor is running.
