My 72 cb450 has two different carb numbers. One is a 14h and the other is a 751a with the vacuum thingy with both having #145s and #38 jets. A guy told me that the 751a is off a 500t. Is this a problem ? I can not get the mixture screw to work on the 751a either even after rebuild. I took it all apart again and resolved it. Hopefully that will work. Question 2 is; what is the real difference between 450 carb and a 500t carb ?
Thanks in advance.