I bought the above SMLRO xdc600 in December which arrived in April and assembled professionally here in Quebec City Canada. After about 8 outings, I heard a grinding sound at the top of the hill near my home. I stopped then proceded uneventfully until near my frint door, the bike became unresponsive. The battery was still charged, all lights and displays worked but no exceleration was possible. I have heard that twisting and releasing the throttle can result in a break so deduce the problem as burnt motor or busted twist throttle. I would like to invite any thoughts on fixes or my next steps. Thank you and as a new member, hello to all.