Modern Vespa

I know this general topic has been beaten to death but I can't find the answer. After shutdown and letting the scoot sit, it floods (unless I turn off the tap and run the carb dry) I just rebuilt the carb but the symptom remains the same. My question: is the seat for the float needle a likely failure (I replaced the needle /float)? I hate to throw parts at a problem without good reason. Also, is it possible the new needle could be defective.

Thanks!

Jay
'79 P200E 12000 miles

check out the needle with magnifying glass.
There should be no lip below the point....old ones look like a snow capped mountain where a lip has formed as it wears down on the seat .
should be no lip..and a nice even taper to the point.
there are good quality and crap quality
The seat can wear down but I don't think its changeable????

Perhaps some kind of reaming tool could be fashioned to clean up the hole so the pointed rubber needle seals?????

Or the body of another carb as a donor
good luck

float set too high... its a bit of very fine tuning/adjustment.

Voodoo has used a wooden skewer in an electric drill to smooth out the seat to good effect.

Sounds like the seat, i would try the skewer tick. I made it a habit to shut the fuel off before pulling into my driveway.

Are you using a red-tipped float needle? They seem to seal better than the black ones. Cleaning the seat helps too, as Ginch suggests.

Use a q-tip mounted in a drill. Coat the q-tip head with some fine valve paste. C

Here's a link to the souvlaki skewer method which seems to work pretty well. https://modernvespa.com/forum/post1823915#1823915

Use a red tipped float needle as they are designed to work w/ E10 gas which ruins the black tipped ones.

I've used the qtip and toothpaste in the past. Skewers, who'da thunk it? Nice one Voodoo.

Exactly what I do

That's gotta be hard on the ears

I work on antique clocks. When cleaning a clock you take it all the way apart. One of the things that needs to be done is pegging the pivot holes on the plates to clean them. Yep...supply shops sell peg wood just for this purpose!