Carb Questions

That is correct. Although o-ring is misleading. It's more like a rubber gasket. Looks like this...

http://www.motorcyclecarbs.com/_P12161.cfm

Now I believe you have shown me why some of my newer carbs are jetting odd. I should have known, when I seen the security screws. I will try and get it apart tomorrow and see if its an issue.

Did the shop measure the float level? And check the float needle valve for a witness mark? And pull the slow jet and make sure it wasn't blocked? If the inside of a carb looks dirty, it needs to be cleaned more. If the inside of the carb looks clean, it may or may not need to be cleaned more.

The only way I could get the float height right on mine was to put the tube off the bottom through a cork in the big hole and run it up the side of the carb body, and slowly add gas. If things went wrong, I had to drain completely and start over. Even then it was fussy process, but that's when I finally got it right.

Unless they used a micro scope, how does one determine if the float valve is worthy? And if you get it to seal, what happens when it rotates a degree or so? Some parts you look at, and some need a little more work. Some that appear shiny, are in fact worn out. Vintage Bob