LiPo cannot handle high discharge rates. Check out this site. It has a table at the bottom with the different pack configurations, their capacity and discharge rates.
The smaller packs (only 350mAh) have a discharge rate of 20C = 7A
The larger packs (1.5Ah) it is 8C = 12A
You need around 75A to get a stock motor off the mark. While running it would draw say 30A.
While the LiPo would run you would notice a lower performance compared to NiMh packs