Which OFNA buggy do you have? If it has a force engine then type in part # 52099 at nitrohouse.com and its there. A roto start can be a pain because the battery can die on you when your out bashing. Your pull start probably broke because you kept pulling on it while it was very tight, if the engine is new loosen the glow plug a little while your trying to start the engine then once its started tighten it up the glow plug.