This is the LIMITED SET from OS

Comes with OS-72149100

<MAX-55HZ Hyper>

The power of a .60 in a .55!
The O. S. 55HZ-H Hyper Ringed Heli engine is cause to rejoice for 3D heli fliers! The 55-HZ-H Hyper Ringed engine cranks out optimum power with a minimum of space! The PowerBoost Pipe 50/55 is a first from O.S. – designed especially for helis, improving efficiency and power while featuring a compact size. It also fits the 50SX-H Hyper Ringed heli engine.

Features:
Features the same mounting pattern and silencer size as the 50SX-H Hyper engine
Dual needle 40L carburetor with four-arm throttle lever is designed to optimize the power, performance and reliability of the 55HZ
Produces a range of 2,000 - 20,000 rpm

Specifications:
Displacement:8.93cc
Bore:23.0mm
Stroke:21.5mm
Practical RPM: 2,000-20,000
Output:2.1ps/2.07hp/17,000r.p.m
Weight:408g

Included:
40L carburetor
#8 Glow Plug

<NS 55H>

Normal silencer for all helicopter flyers who prefer 

flat output characteristic and easy hovering!

This normal sylencer can be used with

50SX-H Ring Hyper, 55HZ Hyper, and 55HZ-R