Boggy low end after running

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Skrimshaw

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Location
Summerfield, Fl
Need some advice please. I am new to the sport and don't have engine tuning down to an art yet. I have a Losi 5ive, stock. When she first starts up she runs like a demon. 0 complaints. After 5 minutes or so, the low end power seems to get lost a little. There is still plenty of power BUT...what I did today just to see if it was in my mind or the car, I started up and blew a few donuts then, 5 minutes later, she didn't have the power to do a donut. The primer bubble is half full at this time. So, is this a problem of running to rich/lean? Should I adjust the low needle? Or when the pipe comes in the mail, the problem will resolve itself, cause thats what they do?
 
The bubbles are normal that's a return line to carburetor I'd say the clutch is hot if your running a 19 tooth pinion try a 18 and see if that helps
 
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