Engine Trouble Troubleshooting help needed after the first 30-40 minutes of riding a new ebay motor

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I just got my new motor working for the first time today that I bought from boygoesfast and I figured I would ride it for about a half hour to put some break in time on it and through the whole 30-40 minutes that I rode it, I made sure to take it easy but did accelerate just alittle to feel the thing out alittle. I had no problems that I could notice for the whole first 30-40 minutes except some extra vibration which I was going to take care of when I got back home and just as I was getting back home, I was going to pull in the driveway and said to the stop sign one last time and back and I proceeded to the stop sign and back for the last time and it died with a small POP! POP! at the end. It wasn't a hugh pop pop but it was some kind of a small pop pop which I thought I felt come from the carb like a tiny bit of gas pop popped with it. I gently tried to restart it a couple times after that and it acted like it wanted to start but would not.
UPDATE: Here's a short video for a possible cause that I think caused it. In the video I am showing the carb needle which has me confused because with the normal carbs that ususally come with most kits, the needle is attached to the spring inside the carb and when you twist the throttle the needle moves up and down but mine is not attached to the spring and is not moving up and down. Im not sure if this is normal with my particular carb or not. This is why I ask. I spend $70 on the upgraded carb and they said its one of the best ones I can have with my kind of kit and they installed it for me so I did not notice if the needle is assembled like those of the cheap carbs . I have a feeling that is the issue so I ask. I think the grooves in the needle that keeps it attached to the spring somehow gave way and thats why the needle is not moving anymore when I twist the throttle. Can anyone confirm this or is this normal with some certian carbs? Also, after I got back home, I started to loosen the screws to maybe try and insert rubber to reduce some extra vibrations and maybe mount the engine another way onto the bike so that there isn't so much of a slant and thats when I removed the air filter and noticed the carb needle not moving.
I also want to know if its good or bad to have such a big slant or if its better for it to be as straight as possible. I figure straight is better to regulate the gas flow better but again, this is why I ask. Im kinda new to these kits. Thanks
 
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take the top off the carb & remove the slide to see if the needle is still attached - needle is long & hard to see it move

do not put rubber in the engine mounts - use a small piece of PVC pipe between rear mounting block and frame - be sure that the rear mounting studs are as close to perpendicular to the frame as possible since this mount takes all the force of the engine

the lower the engine is mounted, the less vibration there is (on most frames) so you might have to lower the pedal side chain guard to sit as close as possible to its chain to get the engine low

EDIT: oh yeah, those pops - check that your crank seals are still holding
 
yes

EDIT: if it is loose, check all over & handle everything carefully 'cause there's a missing clip that you must find (or at least be sure has not fallen into the motor)
 
NO, that is a Delorto clone and that is an emulsion tube, that is if that is the carb that you have. If you have the stock NT round slide carb the needle will move with slide.
 
NO, that is a Delorto clone and that is an emulsion tube, that is if that is the carb that you have. If you have the stock NT round slide carb the needle will move with slide.
No? I have it opened up and there does not seem to be the clip anywhere and when I try to pull the needle out, I will not budge. I can get some pictures up in a sec
 
if it isn't a needle, it probably shouldn't move - if it is a needle, it must move & have a clip
 
That silver odd shaped thing fell out when I turned it upside down and am not sure which way it was supposed to go. The carb does not say dellorto clone but it does have the name RUNTONG on it. Here are some pictures

carb (1).jpgcarb (2).jpgcarb (3).jpgcarb (4).jpgcarb (5).jpgcarb (6).jpgcarb (7).jpgcarb (8).jpgcarb (9).jpgcarb (10).jpgcarb (11).jpg
 
That is not a needle, it is a tube that is pressed into the carb. If you look closely you will see two small holes that allow fuel to come up from the float bowl for idle and low throttle. Do not try to pull it out!!
 
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