Its something simple. When it does not fire, check for spark. If you got no spark, check all grounds. Pull boots off plug wires and cut a 1/4 inch off of wire and put boot back on.
If you got spark and it wont fire, try removing pods, open throttle wide open, then with some type squirt bottle, shoot a nice dose of gas through carbs. release throttle, turn kill switch to run and try it