ORIGINAL: DenverJayhawk
Thanks for the replies. The Magnum and ASP four strokes sound interesting. Anyone know how realiable and easy to tune these two brands are? Will they run as well as an OS AX series two stroke? I really want to focus on the engine that will give me the least hassle. If the OS 120AX requires a 17 or 16 inch prop, that's going to be problematic for ground clearance, even with the tail dragger conversion i've done.
Magnum and ASP is the same engines, that is, they come from the same factory, but have different names around the world(Magnum in U.S, SC in EU, and ASP in Asia).
They are often said to be much of the same quality as O.S engines. Actually some are better, since some O.S engines tend to peel a little bit on the metal inside the cylindre.
They are harder to tune though, they are very sensitive on the needles. But once you get the hang of it, it will run very well. Not a problem, even for a beginner. Just be careful, max 1/8 turn at a time, especially on the low-speed needle.