No Spark!!

Purchased a YongShen 200GY Enduro this past spring. Bike has only 43km on it. Wanted the bike to ride in the National Forest here in the panhandle of Florida. The bike ran fine initially...beginning break in period. Back in June, after a leisure ride on the road, the bike would not turn off either by key or kill switch. Had to stall it by clutch to turn it off. All lights, turn signals, and horn work as well as electric start. Figured it was something simple like a loose wire/connection. Removed headlight a few weeks later to begin the search for the loose wire. Went through all the wires only to find nothing. Started the bike and presto the key turned the engine off but the kill switch still did not work. Kept looking for a reason why the kill would not work. Started the bike 5-6 times during this effort to no avail but the key still turned the motor off. Figured this was better than nothing. Went to start it to go for a ride and would not start at all. Lost spark to plug. Noticed the coil was very hot and a split in the plastic casing developed. Ordered new coil and installed today but did not solve problem. Any ideas?