Seems way overkill to put a 82 in a 2.6kg model. At this point though, with the way it's running I wouldn't even put it in the Cub.

One of my field habits is to start an engine then shut it down, then start it again. If everything is perfect, I'll fly. If not, I pack it up and go home. Once I've flown a model with a given engine many times, I'll eliminate this. But I always do it with a new model.

In short, never setup an engine and fly it on the same day.

BTW, this is my idea of a junk model: