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Hi Tom:
Sounds like a challenge.
I'd probably check the ignition system if I thought the fuel supply was working properly.
Replace spark plugs - test run
If there is a manual hi speed adjust screw on the carb, have you tried adjusting it at high RPM?
reply as a comment to this post and I'll try to help.
check your timing advance. It may be advanced a little too much. If that is okay, then make sure your spark plug is the proper one and not a sub. Most ATV's use DENSO plugs and these seem to work the best. (Having a spark with a higher heat range will cause the overheat condition). The other thing is your mixture... you may be running a tad rich.. lean it up 1/8 of a turn. Finally, remove the exhaust pipe and see if they is carbon build-up at the exhaust port... lean it over and remove all you can, careful not to allow any to fall into the engine. (Blocking the exhaust will cause a dramatic temperature increase.)
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,
sounds like the coil is weak or the electronic spark box is goin fuel filter been changed ?right gap on the Plugs? need more imfo on it to do more thks
Listen I have a 2009 EFI Polaris sportsman 500 it starts up goes fine down the road but sometimes it takes a fit an starts to bog out when it starts to do that all I do is shut the key off an back on real quick and it takes off again I'm really confused on what is making it do that because I changed the gas an air filter plus put a new spark plug in it also a new battery can anyone tell me what I could do to try an fix this problem it's got to be something easy because when it does that all I have to do is shut the key off an back on than it straightens up weird I know lol but please help me with some suggestions thanks
All most positive it is in your carb take the bowl off it as you take it off there is a small tube that hangs down that all most reaches the bottom of the bowl need to take a small wire and push through it it is blocked .symptoms backfiring no idle coughing and sputtering if it does start
electric problem
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