Breathing new life into the 318 in the Scamp!
$250 is a no-brainer, do it that is cheap.
It costs $40.00 a hole to bore and hone here.
I remember by grandpa saying when he rebuilt his old 1950's international farm tractor, 10 years later it was using oil and getting low on power, that the price of new pistons and a fresh bore would be really cheap instead of having to pull and rebuild the motor again.