hi i'm pretty new to this. the thing is that my rear carburetor runs a little strange, it sounds like the bike misses and you feel the back of the exhaust pipes so what leads to the rear carburetor, the exhaust gases come unevenly and the vibrations are uneven. I have also wondered if it might be the case that it might leak some air if someone has had the same problem and can give tips, I'm happy. It dates from 1998 and has traveled just over five thousand miles. so I thought maybe it's time to renovate them, I do not know what the carburetors are called or what the model is so if I could get some help with information and also maybe where to buy renovation kits I would have been grateful.