450 tranny problems

i have a 04 yz450f and i cant shift out of fourth gear it doesnt happen all the time but it happens more than it doesnt it seems thought when i pump the clucth it will get out of fourth but i have to stop to do this anyone have any ideas on whats wrong

Not trying to shift UP are you??? LOL :thumbsup:

You are looking for 5th it's not there :thumbsup:

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