Modern Vespa

New to me scooter. cleaned carb 2 times. new air filter, new plug, new petcock. Idles great with mixture screw from 1 to 3-1/2 turns. Twist throttle very slowly, works pretty well. Bogs with quick twist. runs best at 3-1/2 turns but seems like a lot of turns (haven't tried more turns yet). . research is showing 1-3/4 to 2-1/2 turns . Accelerator pump was squirting when I was cleaning. If I press it while idling, engine dies a little, but doesn't increase after. Anything I'm missing? I have plenty of experience with honda scooters, new to italian scoots.

can you post a picture of the engine bay?
(top down from under the seat)

how's the condition of the intake manifold?

any service history?

bought it in pieces, not sure what orig issue was. I removed evap. hose off intake is plugged with a bolt. had to replace brake cable, master cylinder, caliper. guessing it was sitting for a bit. odometer read 4k, but speedometer isn't working at the moment. sprayed carb cleaner while idling, no change. Don't believe I have vacuum leak.

FIXED. I guess 3rd time was the charm. cleaned carb 1 more time. When I removed mixture screw this time, washer and o-ring were stuck on needle, so I cleaned needle real good (had tiny scores around it that washer was hung up on) I carefully cleaned it with 0000 steel wool and cleaner. running like a champ. Also worked the idle jet really good (ordered a 38 to be installed
later) Hopefully will help somebody else.

great job, top marks.

you'll like the #38 jet, wakes up that low end nicely

Good man. When ever I read " I cleaned the carb" in a post, it doesn't tell much of story. I usually recommend stripping it completely down and running it in a sonic cleaner. Spraying carb cleaner all over the place might get you there, but it's so easy to miss something. Glad you got it sorted.