This is my first tech post in a 17 year absence, so be kind.
I have recently bought a 420R with Caterham 6 speed. Going up the box, it is clunky going into 3rd and only 3rd. It always goes in, but not smooth.
No issue on the way down. I have bled the clutch and adjusted the pedal to give excessive travel, but no improvement.
Ant ideas? Any thing else I can try without striping the gearbox and replacing the synchro?