YS Engines 91SRX-Tareq Side Exhaust Helicopter Engine w/Fuel Injection

YS Engines 91SRX-Tareq Side Exhaust Helicopter Engine w/Fuel Injection
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Price: $479.99

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This is the YS 91SRX-Tareq Side Exhaust Helicopter Engine. Developed in collaboration with Tareq Alsaadi, the 91SRX-Tareq was designed for demanding 3D pilots. Featuring the latest in YS helicopter engine technology, the 91SRX-Tareq includes a redesigned carburetor, combined with a redesigned piston and sleeve and a lightweight machined heat sink, creating the most powerful and responsive .91 engine in the YS line up. 



  • Re-designed carburetor for easier adjustments and consistency
  • Proven pressurized regulator and fuel injection system for a superior throttle response
  • Steel lined back plate to reduce drag for more power
  • Re-designed piston and sleeve
  • Re-designed machined heat sink head          

Type: 2-stroke helicopter engine
Displacement: 0.91 cu. in. (14.89 cc)
Bore: 1.06 in (27.0mm)
Stroke: 1.02 in (26.0mm)
Cylinders: Single
Total Weight: 19.9 oz (565 g)
RPM Range: 2,000–17,000

This product was added to our catalog on June 17, 2013

Verified Owner
Thursday, Sep 10 2020 (about a year ago)
YS Engines 91SRX-Tareq Side Exhaust Helicopter Engine w/Fuel Injection
This is my favorite motor out of the YS line of motors. This motor will pull slightly harder then a OS 105 but some key things to know about this motor are that the manual is wrong about where to set the needles for break in. You need to open both needle valves 3 complete turns from closed for break in. The settings the manual give are not right. The other thing to know with any YS motor is it will not tolerate a lean run as well as a OS 105, the moment this motor goes lean even for a moment it needs to be pulled out and have the head pulled and check the head gasket and piston ring. Piston ring gets shiny and head gasket will have chunks missing possibly leading to blow by. Thats the trade off imo vs the os 105, the 105 will make good power but not as good as a Ys 91 or ys 96 but the os 105 is designed so even a novice can leave it rich and it pulls and if you go lean for a moment it relatively speaking is usually ok but the YS makes more power but you need to know how to tune to get it to pull and it won’t tolerate a lean run.
Verified Owner
Friday, May 25 2018 (about 3 years ago)
YS Engines 91SRX-Tareq Side Exhaust Helicopter Engine w/Fuel Injection
great engine! makes tons of power and easy to tune! this is the easiest motor to tune in the tareq ys engine family and holds it well. I have 3 of these engines and love them!