It's just like an oil debate... some want to bench run them and some of us don't see the point. Thats 4 wasted hours when I could be flying it

Might also like to consider where Zenoah comes from.. its designed to take abuse which is part of the reason why they are generally heavier.. more material to help disapate the heat.

There are many rc engines that wouldn't stand up to that. They are designed to be light and powerful and require proper cooling. Just look at the fins (or lack of) and how thin they are.

My 60 has run from day one on 50:1.. 50+ gallons later still running like a charm and looks great inside.