where can I find smaller pilot jets of Sheng wey pz27 carburetor?
 

I already this installed it to my yamaha ybr 125 the only problem is the pilot jet is very big for 125cc and I search on the internet selling smaller jets like that but can't find one, the main jet isn't a problem. this is not my pic but this the look of my pilot jet I get here in this website I think I need a 20 pilot jet
the stock one is k40a http://https://www.chinariders.rapto...1&d=1507881010

It's probably not that small that you need. Have you tried running it yet? You're thinking Mikuni numbers for jets, they're usually ~20 smaller, i.e. a 20 Mikuni is roughly a Keihin 40, the Sheng Wey being a copy of a Keihin PD, using Keihin numbering. Sheng Wey jets are sometimes hard to find, slow us a picture if you please. There is a kind that is harder to find, if in fact that is type you need, you can solder the jet up and re-drill it to a smaller size.

this is not mine but this is the look of the slow jet of my sheng wey pz27, I bought it in lifan local store, I really like the oem quality carburetor than cheap knock offs, this carburetor is heavier than my kelkong pz27 but I mount it on my other motorcycle and I already sold it, the jets of sheng wey quality is good the only problem is I think the k40a slow jet is very large for 125cc, I don't know what is the meaning of a in k40a

It's like I explained, just try it and see. K40a means it's a Keihin 40.

is it normal? when I twist the throttle a little bit the engine almost die after few seconds 3 seconds after small throttle twist then back to normal idle, i tried to adjust fuel air mixture, it doesn't help that much. my previous aftermarket carburetor kelkong pz27 doesn't have that problem.

Take off the air filter and see if it makes it better, or worse.

it's the same

Does it run better with the choke on?

it doesn't, by the way is there any aftermarket maker of jettings for this pilot jet?