Just got back from the field and I got another 6 flights on this NGH GT17 engine on my Escapade and this is a great running little engine now that I have the muffler issue figured out. I am gettign 9200RPM with an evolution prop and a very good 2000rom idle. I am now sure the whole problem was with me over tighing the bolt and bending the muffler. If I need another small engine oif this size I just my buy another one knowing what I know now!