Yeah I ran a 34mm lectron power jet carb in my Aprilia rs50 that I cr125 swapped. Amazing carbs, you use a tool to screw the metering rod in or out of the slide to adjust idle/mid-range. The carb is dialed in to your setup from the factory and you are given a few metering rods to choose from. A 3-2xl rod would have a richer top end fuel and leaner bottom end and you would tune accordingly. The clear float bowls don't even melt! Also power Jet was super nice and did juuuust enough up top to keep things happy.