Have acouple of questions is the unit eletric shift or manual and what does the shifter feel like when moving it. If it is manual their is a manual shift in the right rear of engine a 12 mm wrench will fit on it.
it feels like it does not want to shift
You will have to remove the cover and inspect give me acouple of minutes going to send diagrams.
the gear shift plate and the shift drum behind it are the areas to look at. Remove the front cover and try to shift the unit while watching these areas should see something wrong. The gearshift plate and shift drum have both been updated because of problems with breaking. If the shift drum is the problem you will have to pull the motor and disassemble the crankcase to fix.
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