Needing some help here, bike starting running like crap the other day and today i ran a diagnostic and the trouble code P1356 popped up which is rear cylinder no combustion no other codes and check engine light never came on ........ where do is start (wires, plugs????)

 

Welcome to the Forum from Colorado!
Wires and plugs would be the first thing to check. Do one at a time so you isolate the problem. Check all connections to the coil for being secure as well.