Parts such as the Exhaust: Protector, Muffler 1, Protector, Muffler 2, Screw, Tapping(1aa), Bolt, Flange (22f) are included in the Yg300s 7mb1 Generator Exhaust parts fiche.
The Yamaha EXHAUST has fourteen products enlisted in the schematic.
The sub assemblies and components that make up this Exhaust include this Spark Arrester Assy, the most expensive part.