CK you are most correct, some lemon engines and people who do not know how to tune or treat an enine will swear its not a good engine. I know of some people who say OS is the only way to go and not to buy cheap China made engines are lousy etc etc etc. I bought an SC46 (ABC) for like USD65 and after 4 few gallons the engine still runs fine and idles decently (I have not spent time to make sure the idle is good). All engines have their own quirky habits, some people at my airfield expect to run a Rossi hard after like 3 tanks of running in (at high RPMs too!). Only engines I hear that are lousy will be something like your LEO, other than that all have been pretty good.

Anyone who expect an LA40 to pull verticals better stick it into a 15 sized plane!