As i have been reading, I am not alone in having problems with this saw. I have a 99 335xpt that starts and idles fine but when you accelerate it just bogs and won't rev. I took the carb apart and replaced the diaphragms and re assembled and still nothing. I tried different gas, checked the fuel line, replaced the plug and yet, still no revving up! My next step is to totally replace the carb but I would like some other opinions as I am a heavy equipment guy and not up on these 2 strokes. Any ideas before I drop $50 on a carb or should I write it off and buy new. thanks in advance.