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Only when warm would suggest something is expanding or at least changing due to a heating effect.
Does it return to easier shifting once cool?
A few ideas,
Maybe engine oil is too thick, try 10/40.
Clutch adjusted properly?
Are you running Heal/Toe shifter? These are known to cause shifting problems.
I had a hard shift problem after the first mile riding, turned out to be a clogged scavenger pump leaving too much oil around the clutch.
Only when warm would suggest something is expanding or at least changing due to a heating effect.
Does it return to easier shifting once cool?
A few ideas,
Maybe engine oil is too thick, try 10/40.
Clutch adjusted properly?
Are you running Heal/Toe shifter? These are known to cause shifting problems.
I had a hard shift problem after the first mile riding, turned out to be a clogged scavenger pump leaving too much oil around the clutch.