YS 120SR Taking Heli Pilots To The Next Level! Breath taking power never before seen in a nitro helicopter! The lightest 60 size crankcase YS have ever produced weighing in at only 544g & producing 19.93cc of power!

Features:

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  New Crankcase Design capable of 19.93cc of power with less weight
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  New Piston & Sleeve Design for increased power
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  Pattented Crankcase pressurised fuel system
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  Fits most 90 size heli's with no modification
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  YS 2 Stroke Plug Included As Standard

Specs:

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  Bore: 30.4MM
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  Stroke: 27.5MM
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  Displacement: 19.93CC
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  Weight: 554g
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  Practical RPM: 2,000 - 17,000
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  Glow Plug: YS 2 Stroke Plug (P0020) Included

Info:

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  Important, YS engines are designed to run a minimum of 20% nitro but Probuild & YS highly recommend 30% nitro for best operation unless otherwise stipulated in the YS Manual. Both YS & Probuild recommend Model Technics Bekra 30% mix.
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  It is extremely important to get the correct gear ratio in your helicopter because incorrect gear ratio can damage your engine.
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  On the last flight of the day a fuel line clamp should be used to stop the engine in order to prevent rust & corrosion.
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  The Hatori 2123 Is The ONLY Pipe Recommended & Designed By YS For The YS120SR