Is the stock carb choke supposed to have 2 levels? I always use mine all the way out until warmed up, but there seems to be a mid-way out point on the choke that makes faster idle. Also, lately the choke has been popping in by itself when riding, is this just normal wear? (Caused bike to stall today at a stoplight). Once warmed up she runs fine without choke, but I am usually too impatient to fully warm up before riding.

Also, I got a Sportster muffler which I haven't installed yet. (won ebay bid for $5!)- Rather than mess with the stock carb and jets, I was thinking of getting a pwk38, and keeping the stock carb and muffler in case i want to go back without messing with anything. Anyone tried a Nibbi PWK38? This is the one I am looking at: https://www.amazon.com/Carburetor-350cc-450cc-Motorcycle-KAWASAKI-SUZUKIApoll...
Think this carb will work?