With the kicker, go in through the clutch first, you may find it frees up once the clutch is out and back in
Mine did that, no idea why it was stuck but pulling the clutch out did the trick
Unfortunately two weeks after putting it together again , not riding it , it had locked up again
Pulled the clutch out again, kicker freed up again, a week later, locked up again........
Pulled the motor apart, no reason why it was locking up
Don't let this discourage you but give the clutch thing a try, maybe you'll have better luck