They were built from 1998- 2004. The second number from the left in the serial # will tell you the year. IE 23XXXXXXX would be a 2003. Parts are available from the Toro/ Lawnboy dealer network. Memory tells me that these normally sold for $329-350 new. A good specimen could sell for 100$+. It is like anything mechanical used- much depends on its history. If unsure- leave it there. These It should start and run well w/o excessive smoke, sound powerful and no signs of leakage of mix below the deck or above from the air filter area or tank. It would be nice to know if stalling issues occurred hot. Maybe mow the guys lawn for him?