Re: 1972 9.5hp Johnson
You actually should be able to tip it up in neutral as well, but over time you find they need to be in forward to tip it up. It can be adjusted, but it is a bit tedious. In fact, if you look it up, you find the controlling wire is called a "reverse lock wire" in the service manual (figure 6-20) and "lever to reverse lock wire" in the parts manuals (see "stern bracket" diagram item 32).
If you had the tilt loose in reverse, everytime you used reverse the motor would jump out of the water.
Anyway, put it in forward gear and the motor will tilt up.
If it won't, look for something in the center of the midsection that looks remarkably like a bicycle spoke and trace it so that you can see how it works.