Mike Brown

Hi, I’ve been rebuilding a TY125 for some time and have nearly finished, the problem is that the original carb has some serious internal corrosion and I can’t get the bike to run properly. I’ve found an incomplete TY175 carb on eBay but have no idea what main jet size to use, the 175 has a 240 main in the bottom of the float bowl while the 125 has a 100 in the conventional position.