RE: Sig Mayhem 3D ARF
remember that pattern pilots have been mounting ALL 2 stroke and 4 stroke engines inverted for years. they run fine, I currently have my YS 1.10 inverted in a Showtime .90 inverted and it will idle at under 1500, and transitions great. Same with OS .46, ASP 1.03, YS .61 , and many more.