Donkey Doc,

I checked the manual again and did find that they do explain the plumbing of the muffler pressure and carb lines on page 5, but do not reference the nipple on crankcase. For those of us very new to the Saito line this is could be very confusing.

Having a OS's with standard muffler pressure and also YS's with pressurized fuel tanks this Saito (by looks only) falls in between the two.

I have confirmed:
muffler is vented to the fuel tank
carb to fuel feed line
crankcase nipple is just vented to outside of aircraft with shortest line possible not to exceed 6"

Thanks guys