Try hooking up to another battery to jump the shorai and see if the starter works normally.
If it still does not crank start checking for a wiring issue ( loose connection to ground ).
These starter motors are very dependable and their are very few reported issues of motor problems.
2013 Ducati Hypermotard SP, 2011 Husaberg FE570S, 2011 BMW S1000RR, 2010 BMW F800GS
2007 Husqvarna TE610 , 2003 KTM 525 MXC