I bought a motor from Dax and it came with an RT carb and a jet kit. the stock jet in the carb is NOT marked !!! does anyone know the size ? The jet kit had 65, 70,75,80, and 85. my motor is ported and polished. With the stock jet it ran great at low rpm but not at WOT. so, I started with the 65. it sucked. then I tried the 85. it sucked even more ! Then I tried the 70 and it ran really well !!! I'll probably also try the 75 when I get a chance, but I think I'm' going to break the motor in using the 70 since it is running so well. Using a magnifying glass and comparing the hole sizes, it's really hard to tell a difference, but it SURE DOES make a BIG difference !!!!
cheers
cheers