My only experience with the Tower .46 wasn't as good as everybody else here. Mine would run all day long on the bench, but over the course of 3 months it died every time I put it in the air. Sometimes it quit right after take-off and other times it would run for 3/4 of a tank. I never did get the problem worked out. I ended up deadsticking the plane into a tree and I never used the engine again. I've helped a lot of other new pilots set thier's up and have never run across another problematic one. They seem to be really good engines overall. I just happened to get the only bad one I've ever seen.