Trying to figure out issues on my generator and tiller. The generator is a very old Yamaha EF2800, Im trying to find an air filter for it, I included a pic of the front of the engine, the airbox and the only sticker I found on the engine. Any help locating a filter would be great. Also pictured is the gearbox on my Troy Bilt Super Bronco tiller. Is it as simple as draining and refilling, and what kind of fluid does the gearbox require? Thanks