Rohit,a borescope is like a flexible periscope that you pass through the spark plug hole. It allows you to see inside the cylinder, in your case, you'll want to pay attention to the cylinder walls. Look for scoring/galling (scraping). Note too, if you see any indication of,localised, overheating on the walls. I sure hope you don't.
Two stroke motors are known for 'heat seizures'. Sometimes, on newly rebuilt motors, rings ( that didn't have their end gaps set to spec) expand quickly and lock in the bores. At times, they micro-weld to the walls. The welds are quickly fractured, and leave behind tell-tale scoring.Typically, the pistons will eventually lock in place. Shortly after, as the cylinders cool and parts can contract slightly, some clearance returns. The motor will start, overheat,lock, and cool....the process repeats again. This will only go on so long before the pistons/rings lock permanently.