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It's likely to be either spark or fuel.
Remove the spark plug and inspect it. There are pictures of good and bad plugs on line, the plug can tell you a lot about the fuel mixture and how well the motor is running.
Check that there is a spark jumping the plug gap when you turn the engine over (the plug body metal must be touching the engine metal to complete the spark circuit).
It's worth trying a new plug in case the old one has failed, even if the spark looks ok, sometimes a plug only fails when under pressure.
If there is no spark, check the ignition wiring (particularly connectors), kill switch, key switch, coil etc. You might have to get an expert to test these things for you.
If there is a good spark and a new plug makes no difference then it could be fuel. Easiest way to check is to get a can of Easy Start or similar and spray it into the air intake as you try to start, if it starts then look for a fuel problem.
Make sure there's enough fuel in the tank, the tap is on (try on reserve too), the hoses are not kinked or blocked.
If it's a blockage in the carburetor it's probably best get a mechanic to check/clean it.
Good luck.
remove spark plug,put wire back on it,ground end opposite the wire end to motor metal.crank over the engine and see if plug is firing,should see blue or yellow spark close to the electrode.i assume your motor is cranking over,right?
Check oil level capacity, to ensure in specs. Check spark plugs, ensure its clean and correct plug for your quad.the only other could be is ign coil breaking down when warm. Check fire at plug when this happens. First ensure oil level is correct. Make sure your electric fan is on when bike is warmed up.
Bradley, Check the attached links,Manuals and guides, Good luck with your Bike
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Carb could be dirty, float stuck or choke stuck. Pull plugs, crank engine and see if you are getting raw gas in the cylinder(s). If you don't get gas to the cylinders, you won't start. You also could have a flooded carburetor.
Have you checked for spark? That's where you need to go to first. Take out the plug, put it back on the plug wire and hold it against the cylinder head. Kick over the motor and watch for spark.
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