The OS 40 LA would fly the plane fine. It took most of the runway to take off.
The fuel was fine and most of the time flying it I was training.
The trainers set up the engine. It was tuned fine but as time went on it got worse and worse. It lost a lot of power. It was hard to start. Now, this is with some of the best flyers at the field setting it up.
It could have been a bad engine...
I do agree it was an easy engine to start and run but if you are going to buy one you should not expect much more than training out of it.
I got rid of it and never looked back.

My TT46 Pro that I paid $69.99 for is far superior.

But that is just my opinion.

Bill