Mine just cracked the skirt off the front piston, it had the same stuff done to it, I bought it with good compression this spring and probably only put 10 hours on it, I just swapped it to another hull and looked at the pistons through the exhaust port when I did that, they looked fine, that was like 2 running hours ago, front piston cracked right in half, rear piston was halfway cracked. So my advice would be even if it shows good compression, it may be prudent to pull the cylinders and mic the pistons and bore to make sure they’re not out of spec and you end up doing a complete rebuild instead of just a top end. Although, atleast in the dirtbike world, a lot of people will put a top end in any two stroke they buy first thing so they know how many hours are on it. My stock superjets give me just as much trouble as this one however none of them have blown up yet, also with unknown hours.