it seems that the la series of engines was OS's attempt to supply a low cost engine for the entry level pilot. In my opinion it was a mistake, from what I have wittnessed the engine is weak compared to other manufacturers .40's and is nowhere as reliable as the fx series. If you are determined to use OS engines,
(which I personnely think is a very smart choice) I would spend the extra money and buy a fx series engine you will be a lot happier down the road.