2nd gear ??? jumping in and out of with light throttle

[solarcycles1]

Finished up a 64 Ca77 Dream but it has a bad habit. Motor #CA77E 103441. The bike jumps in and out of 2nd gear with light throttle. I seems to hold in second better with heavy throttle. I am a light throttle style rider!!! The other gears work fine with the exception it is hard to down shift from 4th. I need to bump it hard to go from 4 to 3rd. Any thoughts and cures????
SS

[LOUD MOUSE]

Split the cases and replace warn parts. ..................lm

Finished up a 64 Ca77 Dream but it has a bad habit. Motor #CA77E 103441. The bike jumps in and out of 2nd gear with light throttle. I seems to hold in second better with heavy throttle. I am a light throttle style rider!!! The other gears work fine with the exception it is hard to down shift from 4th. I need to bump it hard to go from 4 to 3rd. Any thoughts and cures????
SS