The only thing I know for sure is that it will be an M12 nut. I don't remember the thread pitch off hand.
My 2 cents here for what it's worth but save your money on the performance carbs until you get into more advanced upgrades. A well tuned factory sized carb is plenty capable of supporting the airflow of most basic bolt ons and even performs well with a ported head. It will also generally stay in tune better and get better fuel mileage if you have it dialed in really well. My first Hawk ran around on a VM26 clone with bolt ons and could touch 70mph with my big butt in the saddle (17/45 sprockets) and would get over 70mpg cruising along at 45-55mph.
If you just have to have the shiny fancy carbs then go for the PE28FL.
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