You are going to have to completely clean the carb and that should do it (if it was stored with fuel left in the tank (& carb)

 

If you trouble shot all the info here, and it still won't run, then check your crank barings. all you have to do is take of fly wheel cover, and see if there is play (up and down) on fly wheel. if there is some play in crank baring it will give you a nice spark with no comprssion, but as soon as you put the plug in and have comp, it forces the crank to a lower point changining stator tolorences. resualt no spark with spark plug in, and spark with pluge out. If you have very low hours on quad, this may not be the problem. make sure you go through your carb, and set to spec before thinking about this remedy.

 

Clean the crab!!!! if gas was not drained from float bowles before storage the jets are clogged. gas evaporates leaving a clogged pool of premix. tear down carb and blow out all jets, and orffices, like megaprobe suggested. since it won't fire with a prime to the top end I recomended the prior reply.