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HPI Roto Start 2 System - K Series Engines Hellfire and Savage SS owners can upgrade from a pullstart engine to an easy remote starting system! The HPI Roto Start 2 system replaces the pullstarter with a durable metal gear backplate and a handheld shaft driven starter. Starting is as simple as pressing a button. Some disassembly of the engine is required to mount the Roto Start 2 system. The Rotostart 2 is an upgraded version of the original Rotostart with an improved case with shaft storage holder and a circuit breaker for overload protection. The thumb-start button has a safety cover to prevent accidental starting of the Rotostart 2. Complete instructions included. Standard 7.2v battery and charger required