Deadeye: Recently I compared my Magnum Four Stroke 1.20 size with Saito 1.25 numbers published at the Fly Rc magazine on its latest issue.
Magnum: Saito:
Prpeller: 15 x 8 15 x 8
Fuel: Omega 15% Wildcat 15%
Glow plug: OS F type Saito
Altitude: 4,000' 1,000'
Max RPM 8,740 8,600
Idle rpm 1,700 Don't remember, I have to check the magazine again

I have always used Saito engines I have 5 of them (.40, .72, .82, .91 and 1.00) and I love them, but when I was about to buy the saito 1.25 I had the chance to buy the magnum trough Tower Hobbies with a great discount so I finally bought the Magnum 1.20 Four Stroke and paid almost 100 dlls less than what I should pay for the saito 1.25, Big savings!!. But it was my first Magnum and had some doubts about the performance. I broke in by the manual with Omega 10% adding 2 oz of castor oil to the entire fuel galon, then tested with several propellers until I found out that the best performance was obtained with the 15 x 8 on my Hobbico Sukhoi. Now it flies great.
I still love my saitos but I have now a lot of respect for this Magnum 1.20 and there is only one thing where the Saito 1.25 is better than this Magnum=Total weight. In my sukhoi happens that I needed nose weight to balance properly the plane, I had The Saito 1.0 running on this plane adding weight was a must, now with the Magnum I do not have to ad any weight, Of course the plane is heavier but the performance is much better so I will keep this set up for a while.
I hope this info can give any clue for this forum purpouse, but I must confess that I am very happy with my Magnum performance and wanted to tell everybody that I was not wrong choosing this one instead the Saito 1.25, at least for this particular purpose, where weight is helping.

Thanks for reading my toughts.
Happy flying