Is that engine a Predator or Greyhound? Why did you decide on a different carb? Is that the AGK carb adapter? Details look great, Sorry for the barrage of questions.
I can only assume he is changing the carburetor because so many of us are using them and recommended this to him. Myself I have made this change on 4 engines. The PZ19 carbs are re pop from the early 70s usually read "Product of Japan Made in China" on them. Fully tunable MC style carb and for less then $22 postage paid shipping from Huston Texas on eBay.
Only yesterday did I finally add a PZ19 to my FSC with a 99cc Predator, only took it for a test ride and the carb is not even tuned.... felt like I got a new engine. This carb really woke the FSC up!
Others do re jet this carb, I have not felt the need to. Only after talking with others that I may re jet the 79cc RMLL to see what else is in there.
AGK sells an adaptor for the pz19 to fit the predator. Old handle bar stock is just the right size for intakes and what is shown in the picture.