Our first recommendation for upgrades when converting your bike to with an eBike motor is to upgrade the chain. 
 
KMC builds high quality bike chains and offers a variety to strengths, sizes and drive types. Their 11 and 12 speed chains are compatible with all the major manufacturers including Shimano, Campagnolo, SRAM, among others.
 
Currently in stock:
X11 Silver/Black 128 link manufactured in China 
e11 Silver 136 link manufactured in Taiwan for the NA market - eBike specific with highest tensile strength
X12 Ti-N 128 Link manufactured in Taiwan for the EU market
X12 Ti-N/Jet Black 126 link manufactured in Taiwan for the NA market
 
Each package comes with an interlocking MissingLink masterlink for easy chain removal/reinstallation.