Chainsaw Repair

Not only my first Poulan but my very first saw.  4200 w/22-24" (don't know how to measure a bow)bow bar bought new in 78 I think.  Hasn't cut much wood.  The original chain would still be on it but my Buddy??? loaned my saw to an IDIOT!  He burned up the chain and the clutch cutting up an American Live Oak (Quercus Virginiana).  Don't leave my saws at anybodys house any more.  Lesson learned saw & so called Buddy!  The IDIOT did send it to saw shop and was repaired when I got it back.  This the guy that rolled a ring to hold a propane bottle on a trailered cooker, put the bottle in the ring beat it in w/hammer cause ring was too small.  Next step to remove bottle he fired up the acetylene to cut it out!  Again I say IDIOT!!!!!
Shep