YS 120 SR + Hatori #2123 120FS-3D Helicopter Tuned Muffler for 3D YS120SR

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:

New Crankcase Design capable of 19.93cc of power with less weight
New Piston & Sleeve Design for increased power
Pattented Crankcase pressurised fuel system
Fits most 90 size heli's with no modification
Specs:

Bore: 30.4MM
Stroke: 27.5MM
Displacement: 19.93CC
Weight: 554g
Practical RPM: 2,000 - 17,000
Info:

Important, YS engines are designed to run a minimum of 20% nitro but Probuild & YS highly recommend 30% nitro for best operation
It is extremely important to get the correct gear ratio in your helicopter because incorrect gear ratio can damage your engine.
On the last flight of the day a fuel line clamp should be used to stop the engine in order to prevent rust & corrosion