YS 140 Help

[bravo52]

O.K., 
    I've got a new 140 sport and it seems a little temperamental.  Just about every time I get to rotation speed, the thing sags and dies.  I've only run about a tank and a half on the ground so it is still "new".  It idles perfect and it starts on the first pop.  I'm not sure if it is loading up or going too lean.  I'm new to the 140.  Any advice would be helpful.
v/r
Jerry
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