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Cases split. Inspecting transmission?

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Are you suppose to be able to go through the gears with the cases split? Got my 03 yz450 split and its really hard to turn the shift cam with my hand. I can get neutral, 1st, and 2nd but not the other two gears. All of the components are in great shape. No sign of wear

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You have to wiggle and fiddle to get it to roll through.   Without both ends supported by the cases there is enough of a misalignment from the unsupported ends to cause some stiffness in the shift drum sliding smoothly.  

I'd pull the shift forks out and check for wear on the pads and the pins,   if those look good and the teeth on the gears aren't showing any wear you are pretty much good to go.

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