Up For Sale Is A HPI 87110 Roto Start System Savage, Bullet, Firestorm, Nitro Star BB / Force .21 .25 3.0 Engines. New Old Stock, Package Opened For Pictures. As Seen In Pics. If You Have Any Questions Please E-mail Me I can Also Take More Pics If Needed Let Me Know.Due To The Nature Of This Hobby Everything Is Sold As Is. Thank You.