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HPI Roto Start System - Savage
Just insert the electric Roto Start into the drive unit on the engine back plate and press the button, and you can start an engine. You no longer have a difficulty in starting an engine. The Roto Start requires 7.2V straight battery pack (not included).
The HPI Roto Start system replaces the standard pullstarter with a durable metal gear backplate and a handheld shaft driven starter, making starting engine as simple as pressing a button. This version is for .21 - .25 engines ( Not for K-Series engine )