Four Stroke Engines

Duration: 11:00

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Michael Ramsey, associate editor at Model Aviation Magazine brings his Ultimate biplane powered by a 4-stroke, YS 140-L engine to talk about the specifications for the 4-stroke engine and the benefits of using it over a 2-stroke engine. Michael gives us a test fly demonstration to show us how the YS 4-stroke looks and sounds in action, and then discusses some of the things that a YS user should look for when they are doing post-flight maintenance.