Use the TRX 3.3/2.5 recoil pull starter for racing applications where weight savings are critical. It's all new and engineered for long-lasting, trouble-free operation. It includes a heavy-duty spring and cord. Installation requires the starter backplate (#5274) and starter shaft (#5277) (EZ-Start� equipped motors already have these parts installed). If the engine was not originally equipped with a starter, a different crankshaft is also required. Use Traxxas part 5219 (IPS) or 5221 (multi-shaft) crankshaft.