O.S. Speed 105HZ-R Helicopter Two Stroke Nitro Engine W/ PowerBoost Pipe

In 1936, Shigeo Ogawa set up his original machine-shop, making model steam engines. At the same time the first 1.6 cc O.S. Type-1 miniature gasoline engine was made. 200 production models sold under the name “Pixie” were exported. A short time later the OS brand came about. For all these years, OS Engines have been a recognizable name of power, reliability, cutting edge design and quality in the model engine arena. From their much loved “Max” series, to their unique Wankel rotary engine, to the powerful O.S. Speed series engines, they have something for everyone. HobbyKing is proud to be able to bring a wide selection of the latest OS Engines to you.

The 105HZ-R is the engine that precision aerobatic and 3D heli pilots have been waiting for! In order for 90-sized machines to nail huge maneuvers and hardcore, smackdown-style 3D it's all about power, and the 105HZ-R has it in abundance. Displacement has been increased by 15%, while a huge venturi rams air into the carburetor, producing massive power. Plus, it still fits in a .90-sized mounting pattern.

Twin ball bearings support the hardened steel crankshaft for the ultimate in efficiency. Fuel for this engine is recommended to use 10~30% nitro.

This set includes the 105HZ-R engine and the O.S. PowerBoost tuned muffler which gives optimal power and keeps the noise low. This is the ultimate combination for your 90 class machine!

Features:
• The Demand Regulator System (DRS) uses pressure to consistently deliver the optimal air-fuel mixture to the engine — regardless of the heli's attitude
• Featuring the displacement of a 1.05 in the mounting space of a .90
• More displacement means more power, and these engines boost displacement by 15%!
• Balanced, optimized crankshaft for vibration control and improved performance
• Durable ringed construction gives optimal power and reliability
• Lightweight, machined heatsink head
• Same bolt pattern as OS 91SX-H engine
• Includes PowerBoost Tuned Muffler for optimal power and low noise

Specs:
Displacement: 1.048 cu in (17.17 cc)
Bore: 1.442 in (29 mm)
Stroke: 1.024 in (26 mm)
Practical rpm: 2,000-16,500
Output: 3.75 hp @ 15,000 rpm
Weight: 21.03 oz (596g)

Includes:
#8 Glow Plug
One-way Check Valve (For DRS)
Needle Valve Arm for Remote Adjustment
PowerBoost Tuned Muffler