Re: introducing my self and asking some questions
Engine braking on a four stroke won't incur the damage that engine braking on a two stroke will, because four strokes don't get lubrication from the fuel. However, engine braking on any bike switches the load on the chain to the bottom side, and on to the cheap tensioner. If the tensioner roller or its bracket is not properly secured, you could see catastrophic failure. At best, you'll wear out the bearings in the roller prematurely.
Keep engine braking as an emergency maneuver, not as regular practice. If your bike doesn't stop well enough on brakes alone, you should invest in better brakes.