RE: Engine for Trainer - LA or AX?
The LA is a cheaply assembled motor compared to the AX.
You pay for what you get.
Do a search on the LA series and you'll read a lot of stuff. If you are in a money crunch and are planning on getting a .60 or .90 second plane, then the LA is probably alright. But, if you think you'll have another .40 size plane down the road, then the extra investment will be worth it.