07 yz450 dont want to shift

I have a 07 yz450 I just replaced the engine cases. It runs good and when it is in gear it stays in gear. The problem is when I go from 1-2 I hit neutral about 30% of the time, and when I go from2-3 I have to use excesive force tp put it into gear 40% of the time. 3-4 4-5 are also harder to get in to gear but not as bad as 2-3. It dont make any extra noises. If I am under 1/2 throttle it shift easier. When I down shift I dont have to many problems. I thought it could be that the lever was in the wrong position so I moved it but it didnt help. Any help would be greatley appriciated. Thanks

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