It has no fuel filter in stock form, but you can buy a filter or it and place it in the fuel line. While checking the carb, make sure that the float isn't leaking, as with almost every carb on the planet, if the float fills with fuel, then needle will not seat. I do not know of any kit for re-buiding the carb, but the parts can be sourced from you local dealer. Also, remember that the 2-stroke oil goes in the reservoir under the seat, and you should probably make sure that the injection pump is working properly, a test that may be best done by the dealer. Many people would rather bypass the pump, often incorrectly, and use premix, rather than adjust the oil flow.