I never mount my 2strokes inverted, 90or 45 degrees depending on muffler I'm using. Most times getting the fuel tank low enough to be correct is enough problems with this kind of mounting, as I see guys with inverted 2 strokes having problems with fuel delivery and don't need the hassle. On my old pattern bird I used JR4131 ultra precision standard coreless with the 5 pole motor 90 in/oz on 4.8v speed .23 at 60 degrees all around and really liked the centering and power of this servo. I guess the next step up would be a digital, but don't know if its really worth the cost. Any thoughts?