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Magnum Engines XLS 52 Two Stroke RC Engine (RNV)Product Review (submitted on August 4, 2012):
Once you get the low speed needle to keep a set, transition becomes good. On an 11x7.5 we race SPAD Das Plas Sticks, and the engine will out run, and out perform the OS 55 on the same airframe. 3 Stars because the bearings suck!! Once you start eating glow plugs, replace with Boca Bearings. Had one engine warrantied because of the bearings came a part and shot the prop off at 14K RPM. It also is a very sloppy engine, blowing raw fuels from about every orifice you can imagine..but on sale, you can get two of these to one OS, and make way more power on bigger props.