i just bought a savage from some dude on ebay. it has a 3 speed tranny and a pro spec .28 i know i need to tune the carb alittle, but the truck won't shift at all. i am new to this hobbie and don't know what to check or what parts look like. i know how 2 strokes run and how to tune them pretty well but i need help tuning this transmission or checking other parts. can someone please help me out?