Sheng Wey is a Taiwanese brand that sometimes NOT 100% compatible w/ mainstream Japanese brand.
You can tell the type (Keihin/Mikuni) by
http://jetsrus.com/FAQs/FAQ_identify_that_jet.htm
What's ur current needle position? Move c-clip allow more fuel...
--http://www.walbro.com/media/22805/PZ-Tune.pdf
PZ22 is more suitable for 125
https://item.taobao.com/item.htm?id=41725368091