HPI Racing HPI Rotostart 3 System (F-Series / 14mm One Way)For HPI Nitro Star F G Series Pullstart Engines Requires a 7. 2V rechargeable "stick" battery pack and charger. Standard Parts Get things going quickly with the Roto Start 3 starting system, The Roto Start 3 lets you use a handheld starting unit so you dont have to deal with starting the engine by hand it really doesnt get any easier to get running! The Roto Start 3 has an Xtra Long starting wand to make sure you can get through to the back of the