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Could be minor need advice

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Alright got a buddy with a yz 450f 2004. He says the shifter will stick shifting down or up sometimes he already replaced everything except this assembly attached below the shifter. When you shift to final gear it wont go into gear completely and go in and out. Shift forks have been replaced. Any ideas?

The lower assembly

1382560818015.jpg

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Yes.  The lugs on the sides of the 3rd and 4th pinions (gears on the main shaft) are rounded off, and will not hold engagement under a load.  That will have already bent the main shaft shift fork. 

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The gears should be roughly $25-40 each.  Then the one fork.  The cases will, of course, need to be split, so you have to add a head and base gasket and whatever other incidentals you need. 

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