We have a Sportsman 500 EFI, when I start I can run for 3-4 minutes.
after that, when I give gas as it tries to turn itself off, when I release the gas then it works fine idle, but when i throtle the gas again, it tries to turn off
Thus, we have replaced coil

 

Sounds like you need to check the fuel pump pressure,could be going out. With a fuel pressure gauge should be holding 39 psi. Also depending on how old the atv is, could be the fuel filter needs changing? Plus make sure the tank vent is open. OPT

 

It wirks pretty well untill it gets warm.. Then it stops up and will only stay idle
Also its 500 efi 2006
It looks like its some of the sensors that made the atv stop
And we checked the fuel pressure gauge, somethimes it came fuel and it didnt come..

How can i reset the engine, it pops up with : check engie

 

Look at your manual on checking codes on the speedo. If it shows 41 or 45 could be the old T-bap harness problem. Look at the "sticky" about efi problems in the expert section. Plus if you have a correct auto fuel pressure gauge, then the 39 psi fuel pressure should hold continuously, if not you could have a weak fuel pump causing the dieing when warm. When the problem is resolved you can unhook the battery negative cable for about a minute and the check engine light and codes will be cleared. OPT