I just bought the China Model Products 70 in spitfire. I is supposed to weigh in at 10.5 lbs or less flying weight. The plane calls for a .90-1.08 2 stroke or a 120 4 cycle. What engine would you recommend considering easy of starting, adjustment, and performance? I have a ST .90 sitting in the basement but am not sure if it will be enough. I don`t really need unlimited verticle ..