2008 polaris 500 ho efi keeps cutting out and dying when it is warmed up and going on rough terrain or up hill??

PDF]Sportsman 400 H.O. Sportsman 500 H.O. - Polaris

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Polaris Sportsman 500 HO Owner's Manual - ManualsLib

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2011 Sportsman 400/500 Service Manual - Polaris ATV Forum

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Sounds like the jets are cloged up you will need to pull off the bole and clean the pre jet and you shuld be fine

instrument panel

check ground at stater solenoid they are bad about corroding at frame but possible key switch is defective,also could be cdi box they recalled them check your vin, with dealer could be a free fix

a professional carb cleaning, new or CLEAN air filter and NEW spark plug!

I would look for any excessive water or moisture hidden in an electrical component, or corrosion in any connection points..
double chech that you are using the correct amps fuse

Sounds like something electrical is getting wet. in your shop , or driveway , start quad and run up till it's warm. Then take a spray bottle and spray all electrical connections starting from the bottom and work your way to the top. theres lots of connections on these quads. It's going to take some tome unless you get it to duplicate what it does on the trail. When you find the culprit use Dielectric silicone to water proof the connectors . Good luck . thats about the only way to go about this reapair , it takes patiance and time

try seafoaming the bike, it will reduce the emisions a bunch

If you need further help, reach me via phone at https://www.6ya.com/expert/allen_b068623c5003aa4b

I have seen this on a few machines. Start tracing wires. Ground wire from the key is the first on Id check. Grounds on these machines go bad from vibration and rough terrain. Not to mention silt in the water.

you ever change the hub fluid?