I have a Magnum .91 4 stroke that runs great! I also am training someone with a .40 2 stroke that runs very well. I have helped others with Magnum engines and have yet to have a bad one. There are sometimes when someone produces a quality product at a good price (Super Tigre, pre-Chinese). I also have several ASP engines (Another Sh%^&y Product) but they are screamers! I paid $100 for an ASP 1.20 from Horizon's Attic. I keep looking for more! Old habbits are hard to break and that's ok. We all don't like the same thing and that's what makes it interesting!