but it is strange that seals and valves are shot at such a low mileage.
Maybe because his scoot was stored for 6 months and the conditions in storage made his seals dry and cracked.
When I had my house renovated, I stored my other car in a friend's garage for 4 months. When I took it back, the oil seals leaked. I just poured a can of "stop leaK" in the crankcase and the leak stopped.