Motorcycle Questions? Ask a Mechanic.
Hi and thank you for your question.
Generally speaking, when a transmission is difficult to shift, it is related to a clutch problem, in that the clutch is not allowing the transmission to unload which allows the gears to slide back and forth unencumbered on the transmission shafts.
A quick easy to to determine this is to elevate the rear wheels, and rotate the wheels with one hand while operating the shifter with the other. You do not want to run the engine while trying this test. What you are doing is determining how the transmission linkage and gears work when not under a load. If it shifts fine with the engine off and spinning the rear wheels by hand, then you definitely have a clutch issue.
Understand, for the transmission to shift properly, at least one of the transmission's 2 shafts must be spinning. That is why you have to be able to spin the rear wheels by hand to test it. It will not shift if the bike is just sitting still and you are trying to move the shifter.
Let me know what you get,
Tell you what, since you think my attempts to gather information on a vehicle I cannot see with my own eyes is stupid, I will let you try your luck with another expert. Hopefully he won't ask you stupid questions to try to help you.