Bought a tao coolster 110 cc quad for christmas prez. Started right up and ran great for about a mile. After second start it made a pop and will not start!
Checked the valves, timing, installed a new carb, cleaned out gas tank, air filter is clean, new fuel filter. Cranks well but just wont start. It has air, fuel, spark.
Any ideas? This is out last china quad! Our can ams and honda do great!

Thanks

 

Does it have any compression? If it has a spark and is getting fuel in the right mixture that is about all it can be. Try a new plug anyway, and if it was new at Christmas, you are, apparently, supposed to change the oil before use.