More like too high Timing, not jetted right, Not protected by head temperature gauge and or you blasted too long without a good long break-in,
A good break at normal moped speeds/short full throttle runs in is needed because when new piston to cylinder clearance is very tight it doesn’t have a good size gas oil mix cushion between piston and cylinder and gets hot and expands very quick so it locks up
But if you give a good 300 mile break-period both parts wear together allowing more space for the gas oil mix cushion to form,
During the break in You’re able to figure out Bad you timed it wrong, jetted it wrong by different runs, Spark plugs readings, head temps whatever.
Some people may tell you to run that kit, there’s no way I would,
Why would somebody want to run a cylinder and piston that looks worse then one has 10,000 miles of normal wear on it on it