yes 2.5 to 3 turns (revolutions, not clicks)out, fire it up and run it for 2 or 3 minutes and let cool down completely... heat/cool is what accomplishes break in...do this several (3 or 4) times it should take about 2 tanks of fuel......some folks prefer to break in on flights for a few minutes at a time,engines do run cooler moving along at 30 mph but a bench breakin is fine.........balance prop as suggested, if parts vibrate excessively than they are either loose or engine/prop is out of balance

"Does anyone have any suggestions on how to break in a tower .46? The instructions tell you how to break it in step by step, but i didn't install the needle( tower 40 RTF),

how does it run at all without a needle?........Rog