New to the group. I have recently bought my son a 2009 50sx. He rode it once in the front yard the day I brought it home which was Wednesday then it was put up till Saturday morning. It would not start before I loaded it in the trailer to take him riding. Gas is good, carb and jets are clean, put a new plug in it, it does have spark, tested stator and coil. When I did a compression test on Sunday it tested multiple times at around 65-70. The previous owner said it had a fresh top end and the bottom was solid. Top end had about 5-7 hours. This is what the jug and piston look like. Does this cylinder look useable? Any thoughts? Thanks for any advice.