When I got this there was a hole in the air cleaner and it ingested a lot of dirt, so I tore it apart and did a complete, proper rebuild. New bearings, seals, piston, fuel line, filter, carb kit, etc. It also has an NOS air filter. I converted the saw to an internal impulse setup but kept all of the 670 fast idle/choke functionality, so it works perfect. I have about 5-10 tanks on this and it runs fantastic. I have a 2171 so I really don't need it. I also don't need to sell it. I rebuilt it because I enjoy the process. The price is 300 plus shipping PHO.