I am running a 2 stroke 70cc from dax. I pulled the head off today. I pressed my fingers on the pistons and moved my hand left and right, and noticed some play. I can spin the piston a mm or so left and right.That tells me that a bearing must be worn out. this can't be normal. Unless the engines are so cheap that they are like this? I highly doubt it..... I think its time for a rebuild already. I ride the s**t out of my bike....