Very good definitions and solutions for the hydro lock problem.
There is one other thing I wanted to mention, if you didn’t already know it. There is difference between the Saito 120 and the Saito 125. The 120 is a very good engine but is no longer made although you can still find them new. The 125 replaced the 120, it is lighter by about 7oz and the HP 2.2 is the same. Also if you compare the Saito 125 to the OS 120 you'll see the Saito 125 is lighter (about 8oz) and is a little more powerful.
Shubova
[8D]