I had a brand new Saito 125 in mine at first and after 3 days I pulled it and installed the OS. The Saito was lighter but 500 rpm LESS than the OS, burned 50% more fuel than the OS and to boot the engine rusted up after 3 days of using Castor oil in the fuel and after run oil at the end of the day. I was not a happy camper. The OS now has about 300 flights on it, 5 years old, gives me 9400 on a 15-8 APC and is still 100% original.

To say I am not a fan of the 125 would be an understatement []