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Jd 620i backfires and stalls

Noisy fuel pump, runs good then misfires backfires and stalls,

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4 wheeler has sat for 3years. New carb diaphragm & idles fine. hit the throttle & it backfires & dies. Carb has been apart numerous times. Starts right back up. Not flooded.


Have you changed the fuel out, bad gas can cause this, also fuel lines and filter should be replaced as the ethanol eats the lines and filter.
Those hoses sound like the vents for the tank and carb.
When you replaced carb did you tighten the rubber boot that mounts the carb to the engine? if there is a crack in this boot it will suck air and cause this engine to stall,

Oct 15, 2015 | Polaris ATV

1 Answer

What could cause a 2010 Polaris 550 efi to start sputtering, backfiring and going dead after a few minutes of running


I would be looking for a lack of fuel problem
pump , tank vent, filters , fuel line blockage

Oct 09, 2015 | ATVs

1 Answer

Why does my ATV bog down and die when I keep the throttle wide open?


If you are lucky, you might just need new fuel filter and the fuel bowl cleaned out, and maybe new air filter. If not so lucky you need carburetor rebuilt. Backfire is usaully caused by engine running too lean ( too much air for the amount of fuel present). Fuel bowls get gunk in them and the fuel needles and fuel jets get varnished up. The accelerator pump gets worn out gaskets and/or bellows and doesn't give the right amount of fuel mist when you accelerate.

Full Choke is indicative of a motor starved for fuel

Mar 04, 2015 | ATVs

1 Answer

My 2007 450 sportsman won.t start but she backfires


Remove the seat, and take the cover off the air filter container. Place your hand over the end to aid in fuel flow to the carburator. You might not be getting enough fuel which is causing it to backfire and not start completely.
Attempt to start the ATV once you get fuel flowing you should be all set. Clean that filter as well.

Jan 31, 2015 | Polaris 2007 Sportsman 450

1 Answer

2001 honda foreman 400 4x4 was running then


engine is trying to take in fuel and exhaust at the same time causing an over fueling situation. probably damged a plug.

Oct 15, 2014 | ATVs

1 Answer

Arctic cat atv problems


yes as well as the carbs are still dirty

Dec 29, 2013 | ATVs

1 Answer

What would cause stalling and hard start ?


Dirt inside the fuel line, pump, or needs a new fuel filter. Always happens when you run out and suck fumes/dirt into it. Worst case, the needle pin or gasket on the carburetor has damage. Make sure you have a good air filter with this heat, and time of year to prevent vaper lock.

Jul 22, 2013 | Polaris 2011 Ranger RZR 170

1 Answer

Why does it backfire and quit after riding for 1 hour?


is it running out of gas? backfire is caused by a lean condition. I'd check the fuel path from the tank to the carb and clean the carbs. could have something floating around in there occasionally blocking fuel flow.

May 06, 2013 | Arctic Cat 2005 400 4x4 Automatic

1 Answer

I HAVE A 1999 POLARIS 335 SPORTSMAN STARTS FINE WHEN I TRY TO ACCELERATE THE QUAD BOGS FEELS LIKE ITS GOING TO STALL BUT THEN GOES BUT NOT AT FULL POWER AFTER RELEASING GAS THERE IS A LOUD BACKFIRE ...


carbon on the plugs indicates flooding
the backfire indicates fuel being ignited in the exhaust
have the carby /fuel system professionally overhauled

May 27, 2017 | Polaris ATV

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