MAX-105HZ 17.17cc 2-Stroke Heli EngineO. S. MAX 105HZ 2 Stroke 17. 17cc Helicopter Engine The MAX 105HZ has been developed especially for 90 size helicopter models. Its mounting geometry size is the same as most conventional 90 size engines while the displacement is increased by 15%. Also conventional 90 size models gear ratios can be used with this engine without any modifications needed. The new PowerBoost 105 silencer has been developed to match the 105HZ engine, while conventional 90
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