Got a Peugeot 103 with a 16mm phbg on it. Lately it's been idling kind of funny. I've put a lot of miles on this build and am to the point where I'm troubleshooting different issues that have cropped up along the way.
The idle isn't consistent. When you come to a stop it will idle for a second then you'll start to bog down, but it's not because of the idle screw, because if you twist the throttle 1/8th it'll gas up the carb again and the idle will come back for about 15-20 seconds, then it will start to bog down again.
It's difficult to fuck with the air screw and idle screws because of this inconsistency. My first thought was it could be a float issue, like the bowl is being sucked dry at idle until you open the throttle a bit, which rushes the bowl with gas again.
Could just be 'it's a moped.' :) I'm pretty used to the steady 1000rpm purr of my honda motorcycles at this point