it depends on how many tanks of fuel u have been thru or how u broke it in. If it doesnt have that much fuel ran thru it i would check the carb seal for sure and seal it with red trv from permatex all around the base and the backplate if u have took that off. my friend ahd a trx.15 and it ran awesome till it warmed all the way up so we sealeds the carb good and no more prob's. but if u have ran a few gallons thru that your prob time for a rebuild my man.