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My Zongshen ZS125-47 underbone also has a Sheng Wey carburetor, albeit 22mm.
The unmarked main jet is to small, so first step was to identify the size by a jet gauge.
0.75 mm passes, 0.80mm doesn't.
Actually buying a new jet is damn near impossible.
The jet is used in small Keihin carburetors used in small Honda motorcycles and gardening equipment, and you can't buy a jet kit with 5 or 10 jets at a good price, they have to be individually ordered to the tune of $12 each.
For this low budget toy, 60 bucks for a few jets to fine tune seems pretty steep.
I can't find jets on aliexpress or taobao
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