So as I was riding my bike around my yard, I heard a fairly loud bang in my engine and it rolled to a stop. The kick start has almost no compression to be felt, and I hear movement in the engine but it’s not turning over. It isn’t seized at all. I recently had to take the top end off to put the timing chain back on but this doesn’t seem like the same problem. Is my engine blown? Is there anyway to know the extense of the damage without yanking everything apart just yet?