my 02 sporstman 400 is bogging at w.o.t. new plug, air filter, fuel filter, gap is good on the new plug. took apart the carb and cleaned it out, everything looked good, no junk in the bowl! put all back together, amd still the same. did a cam replacement last fall, and it ran good for a few months, then just started acting up during snow plow season! what else could it be?????????

 

Check the buttons in the secondary clutch, they wear out and cause this sort of problem