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2 stroke or 4? if 2 stroke definitely jetted wrong choking makes it rich tells me your main jet is too lean (smaller hole) you need to pull carb check jets for plugage clean jets write down numbers check dealer for correct jet size for your elevation if 4 stroke back fire thru carb indicates timing is off or bad intake valves or cam lobe worn
My opinion, it's running rich and letting it idle for 5 minutes doesn't help. Whether it's carbed or EFI, when the machine is cold, it needs more fuel. As engine temperature increases, it doesn't need as much fuel, and the carbon that started building up on the plug is burned back off. When a machine isn't ran for very long, carbon deposits continue to build on the plug. The carb itself may need to be rejetted/adjusted, it it's running rich,
you are fouling spark plugs. the atv is running way too rich. either the air filter is super dirty or exhaust has been modified (race pipe, baffle removed, etc)
if none of those have been done then maybe your carburetor needle is stuck open and is flooding the motor and the carb needs cleaned.
sounds like your mixture was leaned out because ur filter was cloged up ...making it run rich so was adjusted by screwing air screw out, now uv cleaned it, adjust it to make mixture richer by screwing back in until runs smotherly
The problem would appear to either be with the mixture or with the head.
Too rich a mixture (too much fuel) will cause black plugs - when you take them out do the engine and plugs smell of petrol? You need to adjust the carburettor. Mark where the throttle screw is to start with and then slowly screw it (in - I think) to reduce the petrol flow.
The other alternative is that their is a problem in the head. Does the engine blow a lot of blue/black smoke out when it is hot. If yes it means a full engine strip down!
If it turns over fast it is not the battery or charging system. If it turns over fast but does not like to start when motor is warm it is probably running rich. If it ran good before and the carb has not been messed with i would check the air filter. It needs to be nice and clean.
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