YS91SRS Heli Motor

New even more powerful 90 size heli motor from YS, Featuring a brand new crankcase design, new cylinder head design, new cylinder liner & piston design & new crankshaft the overal effect is a huge power increase while still keeping the same mounting patterns as a standard YS 91SR! it really is simply the best! Hatori have been working closely with Mr Yamada in Japan to make sure the Hatori systems in combination with YS brings the best punch of power possible thats why we (Probuild) Hatori & YS recommend the Hatori 946 pipe for use with this new YS91-SRS heli motor! 

Features Include:

• NEW Larger cylinder head for better cooling and performance

• NEW Steel lined backplate to minimize drag resulting in better performance and increased horsepower
• NEW Piston & Sleeve design increasing both performance and efficiency
• Proven Regulated fuel system for positive fuel flow during all types of flight conditions

• • DISPLACEMENT: 14.89cc
  • BORE:27mm
  • STROKE:26mm
  • WEIGHT: 553g
  • PRACTICAL RPM: 2000~17,000
• The new YS91SRS  has a steel lining on the back plate to minimize drag to increase performance and horsepower. Back plate mounting RPM sensors will not work, because the steel lining will block the pick-up. A magnet mounted on the clutch bell or fan unit is recommended. Another option is to replace the steel lined back plate with an all aluminum back plate (same as YS91SR), if you choose to use your back plate mounted RPM sensor.