So as i was doing some post practice day maintenance, i noticed that the air inlet tube was torn, so i took it apart and there was a bit of dirt on the ventury, i opened the motor up and there was a small amount of what seemed to be like sludge on the piston, so i cleaned it out with motor spray and everything seemed fine until i checked the pinch, i can turn the motor over by hand but there is still some pinch, the worrying thing is that this motor is only about 3/4 of a gallon old.

Is this motor ruined or is it still good?