what do you do for the gas/air ratio on a weedeater 2-stroke?

i made a motor bike and i rode it over 137 miles so far, it hasn't given me much problems except one day it lost compression so i rebuilt it and i put in a new sparkplug and rebuilt the carb after it was running better than ever and the next day i went to ride it and it wouldn't start so i cleaned the carb again, then it was working again but it was like there wasn't any gas, i used to be able to go 29mph now i can only go 16mph with the wind, if i give it too much throttle it will bog down and slow down, so i can only give 1/4 throttle. i have tried messing with the pin in the carb and the tuning screw but they don't seem to do any  thing, what is wrong?

NachoMahma7 years ago
. You probably screwed up when you put the carb back together. It's probably fixable. . There are small passages that are much too easy to restrict/plug if you don't know what to look for. There can also be other parts who's function may not be obvious. Find a manual for the carb and make sure you are putting it back together correctly. . You probably also need to replace all the gaskets. . Make sure that the fuel line into the carb is in good shape. It can become plugged with no outward signs.
BIGHAIRYDUDE (author)  NachoMahma7 years ago
the fuel lines have been replaced a couple months ago and are still in good shape but the gasket from carb to cylinder is torn just a little could that be the problem? i am pretty sure i put it together right but is there a certain way you have to put back the pin? one thing about the carb is there is only one tuning screw. i have fixed weedeaters before but this just is weird cuz i have no idea what is wrong with it.
> the gasket from carb to cylinder is torn
.  That's where I'd start.
.  If that doesn't fix it, I'd get a gasket/rebuild kit and rebuild the carb again. It's a good idea to replace the gaskets every time you disassemble a carb.
BIGHAIRYDUDE (author)  NachoMahma7 years ago
alright thanks a lot!