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Magnum Engines XL 91 RFS Blue R/C 4-Stroke EngineProduct Review (submitted on August 30, 2010):
I am very impressed with the Magnum XL 91 RFS 4 Stroke Engine. It is was easy to start right out of the box. What really continues to impress me is that it continues to be easy to start as well. The idle is simply fantastic. It just stits there and idles it seems forever without any sign of wanting to quit. I never expected such performance in a .91 sized engine and at such a reasonable price.