I am a new Nitro User and cant get the motor to start. The other confusing thing is that the motor only turns for like two seconds and then you can turn if for a while, this doesnt seem right. It seems you should just be able to hold it down for like five seconds and the motor would start. but it wont turn that long, but my main question is that black cap on teh carb, shouuld that be on or off while starting, and what are tips to getting this thing started, im really confused and spent like two hours trying to get this baby running. Thanks!!