Sounds like the crap ebay kits made from China by aliexpress sellers flocking to ebay , too cheap to be true usually means issues later.
Send us an email (click here) for whatever you need and I will make sure it is all retail japanese parts for a japanese carb
Float Height = See this topic (click here……) and look for my reply that shows the picture of the correct float height
(do not worry, GT125 uses the same carbs as the 250cc , it is just down-jetted to for 125cc that’s all)
Other parameters like float height is the same on both 125cc & 250cc
Any time you get stuck with something during your rebuild, take a photo and post it on here so we can see what’s up!
Don’t forget to replace intake o-rings like these…. = These can help with rough running, incase bike is leaking air under the rubber intake boots! (often overlooked)