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Welcome ! Don't be shy to ask questions ! One way or another we'll get it figured out ( unless its a D@#$ Vespa orStella like I now have ), Then your in the same boat I am ! Praying ! =)
will

Try a vespa carb ! They can get just as frusterating as the gy6 carbs !! They are gravity fed ! If they are oil injected more irritating to deal with . They got the d@$% carb crammed into a tight spot ontop of the engine . My 2 bits ! ;D
will

Just a quick update . My scoot is still having carburetor issues . I may be looking at rebuilding it after the first of the month . Yesterday I was able to start the engine but it is spitting oil a tad from the exhaust pipe. Normally on a gy6 engine you would be in big big trouble if that was happening . That isn't the case on a Vespa type 2 cycle engine. The 2 cycle engine smokes abit more and it actually can be used to better tune your Delorto carb . I'll be posting about the differences between the standard GY6 carburetor and the totally different Vespa 2 cycle carbs later tonight or early tomorrow. Even with the Japanise 2 cycle engines the italian scoots carbs are totally different . I saw the postings about others having carburetor issues and thought posting about a vespa carb would be nice just for an info purpose. Have a great start to your week !
will ;D

Not recomended using a dremil ! Best to spend the extra and get a proper case boring tool. I tried to use a dremil when my 61mm cylinder wouldn't fit into my old scoots crankcase in March ! Big big hassel when trying to fit . The case boring tool will help keep things in parameter between the 2 crankcase halfs with less hassels. All it takes is just a little too much with the dremil to screw up your days work and being forced to get another crankcase!!
Scooterworks.com if I remember corretly has pre bored crankcases that will be less cost than buying a boring tool outright and doing it yourself.
will c.

could a clogged or dirty idle or main jet cause an issue like I am having ?
will

The same sparkplug coloring from the 4 cycle gy6 still applies to the 2cycle carb I now have in the stella . This engine also has a 3 port , reed type valve and no overhead camshaft, timing chain or valves . That in itself does help when upgrading to a larger cylinder piston and head . No case boring is required on the 150's crankcase either to put a 166cc or 177cc cylinder piston in.
Will C.