How to know when you need a new top end?

How do i know if i need a top end rebuild on my 2000 cr250?

• i hadent ridden my cr250 in a while so i thought id better take it out to keep it moving, i didnt have heaps of 2 stroke oil left so when i mixed it im sure it was gonna run real lean, i went up and down the street and the rear wheel locked up i pulled in the clutch and stopped i started to push it home and it was still really hard to push with the clutch in, i have been told i will prob need a top end rebuild, just wanted to double check before i pull it apart. cheers

• Answer:

  Sounds like you froze it up because the lack of oil. If its frozen, you wont be able to turn the motor over....