I just noticed 2 days ago after long ride (100-200 miles) problem with transmission. It shifting well up to 6th gear, but when i am shifting down it goes to 3rd and then when i try to go to 2nd and 1st it wont shift, so pedal is not getting stucked, but in order to go to 2nd and later 1st gear i have to literaly force that pedal super hard until it shifts, it moves but doesn't want engage in a gear. It doesn't happen all the time, but yesterday was almost all day. Oil is changed 800 miles ago 10w40 motul 5100.
Bike is 2007 with only 12.000 miles well kept and maintained looks like brand new, never dropped. Previous owner barely made 500 miles in 2y.
Any suggestions and advice, i just hope it's not those forks in transmission.