The kickstart shaft is splined onto the quadrant, in some cases just pressed on. Here the shaft can be removed from the quadrant and the relative positions changed. Others are brazed up construction, so this is not possible.
Removing the outer gearbox cover exposes the kickstart quadrant, you will see which sort you have. The inner cover has a quadrant stop, the retaining nut can be felt at the back of the inner cover where it joins the main case. Is yours in place or sheared off allowing the quadrant to return too far clockwise?
Jamming is most often caused by damaged teeth. If you have changed the ratchet, then all should be fine. The quadrant and ratchet come with either flat or pointy teeth (early and later types) and do not mix. This has been a topic already considered, and is in the Forum Gearbox Section. Parts incorrectly ordered or supplied were the ultimate answer.
Swarfy.