O.S. Max .91 SZ-H PH Hyper Helicopter Engine with Pump has a redesigned crankcase to provide better support for the crankshaft and thrust bearings. New 60M 3-needle carburetor with mid-range needle for precise adjustments and push/pull throttle arm for added precision in power control. Front and rear ball bearing-supported crankshaft. Blue anodized cylinder head with "O.S." and "World Champion's Spec" printed in White at the top of the head. Graphite backplate pump mount. Two year limited warranty. This product includes O.S. Max .91 SZ-H PH Hyper Helicopter Engine with Pump with #8 glow plug, one .004" (.11mm) head gasket and one .008" (.22mm) head gasket, decals, Woodruff key, needle adjust screw (2.6x5mm) and instruction manual.

Fuel: 10%-30% nitromethane with at least 18% lubricant. Lubricants may be either castor or synthetic oil or castor/synthetic blend.
Field Equipment: glow starter, fuel bulb, fuel can filter, fuel pump
hexagonal starting shaft (depending on brand of helicopter) electric starter, battery and fuel tubing.
Muffler- This is specific to the heli.