Hobby Products International 87126 Roto Start System K4.6
This is the HPI Roto Start System Shaft Drive Starter from HPI Racing. This version comes with the back plate that works with HPI's K series of engines, such as the K4.6 found on the Savage SS .28 monster truck. This will also work with the new Racer's Edge Sure Fire .32 monster truck engine so you can drop it into your Savage and start it with a roto start instead of a pull start.