1.Hey guys i was running my gt today and at first i couldnt get it to start... Like i put it on the starter box and the motor would rev up like it was about to start but just before it would fire up it would just stop revving just as if i had takin it off the box which i hadnt. I eventually leaned in my low-speed needle which helped it to fire up. I just wanted to know if this was the right thing to do for this senario?

2. Alright, once i did get it running whenever i ran it for awhile acceleration became slower and the truck eventually just cut off almost like it was drowning in fuel or sumthing. But by the amount of smoke i had comming off the motor it seemed like it was lean. But during the whole time i did have a decent amount of smoke comming out at the begining of the run till it cutoff i think. It only ran about half a tank when it cut off so it still had plenty of fuel. So with this information which needle is it that is causing this to happen, and do i need to turn it in or out?

Thanks alot guys

Can somebody please help? If i need to go into more detail let me know and i will try to describe what the motor is doing better. Im sure this is really simple i just dont have the knowledge that you guys have to figure it out. thanks

Do you have a temp gun. If not, you really need one. If you were running under 150 degrees, then you prob wouldn't get much smoke and that is too cold for nitro engine. During break in, the most important thing is heat cycling. You want to get the engine up to operating temp(over 200 degrees) as quickly as possible, and keep it there for 2 minutes. Shut the engine down(my preferred method is just sticking my finger on the flywheel). Whatever you do, don't run it out of fuel, or pinch the fuel line to stop it, this runs it excessively lean for a few seconds, and could damage a new engine. After break-in I don't think it is quite as big of a deal, but still not advisable. Especially don't run it out of fuel at WOT. (*seize*) Let the engine cool COMPLETELY with the piston at BDC, and repeat 5-10 times, leaning HSN slightly each cycle.
As far as LSN, tune it to run bubbly with a slightly high idle for break-in.
Throttle inputs should be smooth, and gradual, and you shouldn't hold WOT, and rev high for more than a few seconds at a time during break-in, getting more aggressive with the revs gradually as you lean the HSN in the later cycles.
Heat should be above 200 degrees, and depending on the engine, as much as 300 degrees(mostly for high end engines). For most 'sport' grade engines the target temp is 220 to 280 for good throttle response and performance, while still preserving the longevity of the piston and sleeve.
For after break in running, Idle should be set so that it will run for 30 seconds and not load up too bad, and after idling for 10 seconds, you should be able to punch it and have pretty decent throttle response. If it bubbles, gurgles, and hesitates before revving then you have a rich low end, and LSN should be adjusted in very small increments until it performs to your satisfaction.
HSN should be set to give good acceleration, and top end while still providing plenty of smoke throughout the whole powerband.