wisecobandit
ArboristSite Lurker
Bearings would not cause a fuel delivery issue tho. It sounds more like a lean heat seize due to lack of fuel which you've got away without bore/piston damage.
Whilst im reluctant to say its not bearings causing the locking up I would say worn bearings are rare and mainly replaced at full overhaul stage. That's not to say they don't fail but a saw like the 3120 wont have been used as often as smaller saws and had the use. The obvious exception is milling and how much its done. Did the previous owner mill with it?
Im not even sure the 3120 uses the shielded bearings? Certainly the 394 I rebuilt yesterday didn't have shielded bearings in and the 385/390 range only have them on 1 side.
Personally I would treat it to a new fuel filter, fuel line (they can go soft as well as crack) and give the carb a clean and run it and see how you get on. If your unhappy once its up and running or its locking up again stop using it so you can look into it deeper.
Whilst im reluctant to say its not bearings causing the locking up I would say worn bearings are rare and mainly replaced at full overhaul stage. That's not to say they don't fail but a saw like the 3120 wont have been used as often as smaller saws and had the use. The obvious exception is milling and how much its done. Did the previous owner mill with it?
Im not even sure the 3120 uses the shielded bearings? Certainly the 394 I rebuilt yesterday didn't have shielded bearings in and the 385/390 range only have them on 1 side.
Personally I would treat it to a new fuel filter, fuel line (they can go soft as well as crack) and give the carb a clean and run it and see how you get on. If your unhappy once its up and running or its locking up again stop using it so you can look into it deeper.