RE: Breaking in a new engine
I have a Tower .46 and .75 and I have to compliment both of them. They both have great power and are reliable. I haven't had a single deadstick with any motor, including the Towers. I haven't even heard either of them skip a beat in the air. Idling is a plus for both of these. I haven't had to adjust the low speed needle on either of them and they will idle for a full tank if you let them, then transition to wide open without a hiccup. I can honestly say that the .46 is the best running 40 sized I have owned.
HOWEVER, you must make sure the carb is seated all the way down, and you must have some idea of how to tune a motor. I didn't think it is a challenge to tune them at all. I realize that there are easier to tune motors available but a couple more minutes doesn't make a difference to me. As far as breakin is concerned, I did the same with any other motor. Run them on the rich side for a couple of tanks, then progressively lean them for a couple more. Then they are ready to fly and finish breakin in the air and continue to get better for up to a gallon.
Sorry about the rant, but these motors deserve a little more credit than they have been given. They are good motors and they serve their purpose on a budget. That is, if Tower ever has them back in stock [:@] !