If you can replace an engine and your in So. Cal., maybe it just needs carb work , Ive seen a few that think the engine is blown when the primary chain is slapping around..
https://inlandempire.craigslist.org/mpo/4292037532.html
For posterity. $1200
https://inlandempire.craigslist.org/mpo/4292037532.html
For posterity. $1200