Polaris rz570 starts, when given gas it jerks and engine light comes on

Old fuel, dirty carb jets. Low fuel level in carb. Has it been sitting up? Check air filter and plug.

backfiring is usually a sign of an air leak in the intake manifold

clean out the carb first

fast idle start usually indicates an air leak somewhere.check carburettor bolts are tight and engine head bolts are tight.try that first

fuel pump

you might have a dirty carb.check the big jet in there as it might have a blockage.sounds like you have enough gas going through the small jet to start the quad and for slow speed but when you want to give it good power, it starts to bog down.do the carb thing first

sounds like your high jet in the carb is either clogged or you have water in your fuel.

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

Sounds like one of the wires on the loom might have come undone, just run through the loom, especially all the wires to the ignition.If that fails, looking at the model, could potentially be a CDI failure. Good luck

sounds like its running rich. check your float height and then lower your main jet needle a notch