HELP!!! 1999 POLARIS SPORTSMAN WON'T START
 

We had the flywheel changed about 3 months ago and it has ran good ever since. Then a couple of weeks ago we were riding it and it died and now it won't start back up. It acts like it did before when we had to replace the flywheel. At the time we did not replace the stator when we did the flywheel. It has fire and does try to start. ..We put new gas, spark plug and don't know what to do??? Help