It would fit. Whether to stick with 2 strokes is your choice. A 2 stroke is easier to tune and take care of and can rev higher with a smaller prop. 4 strokes give you more torque and top out around 10k rpm, turning a bigger or higher pitch prop to compensate for the lower RPM. If you want to emphasize vertical performance and acceleration or just want that throaty growl of the 4 stroke, then go for it. If you want a bit more top end speed and the simplest possible tuning and break in, get the 2 stroke. I can tell you that Magnum 4 strokes take a long time to break in fully because they are ringed. The OS 2 stroke will be ready to fly after 1 tankful with some rich running for the first 5-6 flights. The Magnum will need to be started and stopped 10 times (about 3 minutes per run) before you can even think about flying it, and will likely not maintain a good idle until after 10 flights or more. It won't be at its best until easily 20 flights on it.