Hi I'm new to nitro engine monster trucks I have a savage X. The problem that i'm having is the engine won't turn over. I have a electric roto starter 2 and its fully charged, the roto turn but the engine just turns but it won't turn over to start. I've had my savage for 6 month and never had any trouble. Can someone please let my know what happen so i can fix it. I tought it was thegears but there fine. Any help would be greatly need.