So I got a spare 250 motor that I pulled from a low mileage bike a couple years ago. It only had 2000 miles on it and it still looks brand new. I was told it has low compression but I never investigated it. I find it hard to believe the motor is toast but I'm too lazy to dig into it. The guy I got it from was a bit of a meathead so take his diy diagnosis with a grain of salt.
It's complete and untouched minus carbs. Like I said, it looks brand new. Good way to supercharge your kids power wheels.

How about $100 bucks?