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Mikuni VM26 (& copies) is the answer. BOTH jets is easy to find in local powersport shop

低處未見低，賤物鬥窮人:eek2: http://www.ebay.com/itm/111477736195
Parts house sold stronger [加 add 硬 hard 自 self 鎖 lock 型 type] version to...

ie. EBC FA086 or equivalent
the Made in Taiwan also not that expensive http://www.ebay.com/sch/m.html?_odkw=&_ssn=sokbrake&_nkw=ld125

http://www.microsofttranslator.com/bv.aspx?from=&to=en&a=http%3A%2F%2Fwww.motorfans.com.cn%2Fforum.php%3Fmod%3Dviewthread%26tid%3D459752%26page%3D1%26authorid%3D75082

Spray some contact cleaner if just moisture / dirty...
btw Ign s/w cames in different grade
http://item.taobao.com/item.htm?id=44976748768 (Google Chorme auto-translate...) ...