warped gear
well i think most of the 2.5 not all but most dont run right anyways and i musta got one of the bad ones cus i am pretty good at tunning seeing how this is my 5 nitro motor and i am using a temp gage to tune it it always tries to overheat befor it has the power it should so i just run it to freeken rich so i dont have the power and i can affored a new motor cus im only 16 and its not easy to save up and buy the truck itself.