have you tryed letting the clutch out while holding pressure on the gear lever... had a honda years ago I had to do that sometimes..
On the Honda it was a weak detent spring not indexing the selecter drum in the correct position sometimes..then the gear lever
mechanism not being able to pick up the drive pins on the end of the selecter drum...

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...