If it turns over too freely it might have a stuck ring so no ah compressiononi. If it’s definitely getting a nice blue spark you could try priming the spark plug hole with a cap full of fuel and see if it fires. If it fires and quits you might have a fuel feed problem.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience