Is it the gearbox or me ?

[darrsi]

I had a sudden problem with not being able to change into 3rd gear, it was like it was finding a false gear and going no further, then i'd try again and it would clunk into 3rd but it sounded grim.
I had the "main gear selector spring" changed and it all went away.
As far as i'm concerned the gears should all change smoothly, they shouldn't need selecting twice at all.
Although the heavy sounding clunk into first from a stand still is a normal trait of the bike.