like i said, i picked up a 5.5 b&s from a goodwill outlet for 35 dollars. they drain all the fluids there so you cant test them or anything. they price them on how clean they look basically, the most expensive of all the rototillers, edgers, and lawnmowers was like 60 dollars.
all i did was check the compression by pulling the starter a little, pulled the plug boot off and checked for spark, and looked at the basic case/head for cracks/fractures. it checked out fine. i took it home, added some gas and it started up on the second pull. it wasnt idling right so i tried adjusting the screw, adn the fuel/air mix, wasnt helping. so i then checked the gasket from the gas tank to the carb, and it was torn to hell. 3.00 dollars later it ran perfect.
im happy with what i got, but those clone engines do seem nice also. plus my neighbor just GAVE me a brand new 5.5 briggs, he was going to throw it away. it works perfect. the transmission went out on his pressure washer or whatever it was (not sure) so he took the engine off and handed it to me.