I have trouble with my all wheel drive it's an 02 sportsman 700 twin what should I start looking for

I first check both spark plug and coil.. Pull spark plug out and visually inspect for any dirt touching both electrodes... Next, Plug the spark plug back into the spark plug lead and earth it to the motor(make sure the spark plug is touching metal)then try turning the motor to see if the spark plug is sparking...
Also the link below is a short YouTube video showing the right colour spark and I never thought about it but it should spark over the top of the centre electrode,
How to check for Spark Plug Fire in any engine
If it does spark then it's a fuel problem. Check the needle and seat in your carby, You need to pull your carby off and unscrew the bottom half from the top, 1st sign of a needle stuck inside the seat
is a dry carby There you'll find the float, push the float up and down and see if the needle above
the float slides up and down from the seat, If the needle stays up then it's stuck and NOT letting
the fuel into the carby, Just pull it down with your fingers to loosen it up..I hope this helps.... CHEERS..