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Home › RC & Power › ✈️Aircraft › 🚁Helicopter › Engines Plugs Mufflers Fuel › YS91SR or YS91ST?
09-15-2009 05:35 AM  11 years ago
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TmMugen

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Tiny Little Red Dot aka Singapore

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YS91SR or YS91ST?
Got a friend who is looking at the above and cannot decides..

Can I ask what is the main diff.?I am a noob flyer from Singapore! Team Nitro Magic
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09-15-2009 01:58 PM  11 years ago
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BJames111

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San Diego, California

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the SR is the newer engine. It is a "long stroke" designed to run at slightly lower rpm than the ST. I have owned both, and the ST is a good engine, but the SR produces more power.
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