That would be one solution to try, if you got a throttle control gear from a later model that had the 1/4-20 screw. But not sure if you used that, would it also prevent you from idling low enough to shift?
I think I only ran across that once or twice but don’t really remember what I did.
In one case I may have actually filed down the leading edge of the cam a little to create a sharper angle that would pick up the roller easier.
1. Have you checked synchronization to see if the cam needs to be adjusted in a little?
2. Is the throttle control pinion #19 meshed properly with the throttle control gear #21?
