If the camplate spring is new, then you can shim it up by dropping a ball bearing into the dome nut cup before adding the spring. Triumph doesn't make these springs, so none of the 3rd party spring manufacturers is quite sure of the exact pressure it was designed to have.
When the gear "jumps" out it eagerly applies all 40 HP of engine output to the shifter fork and camplate guide grove. This as well as round off the "dogs" on BOTH mating gears.
It can get expensive VERY fast.
Best of luck. :bigt