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Magnum Engines XL 91 RFS Blue R/C 4-Stroke EngineProduct Review (submitted on November 19, 2010):
One of the best idling and transitioning engines I've owned. Break in was easy. It runs great on a 14X6 prop, 15% cool power fuel. Using 3 of them presently, 1 in a Four Star 60, a vintage Astro Hog, and a J-3 Cub. I prime the engine and 1 or 2 back flips, it's running without any tinkering at all.