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Polaris 500 2001 idles fine but has no power and backfires when throttling up

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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

2015 Polaris 900 won't start. Was starting with fast idle, rough running with backfires, now won't start at all. Was running perfect.


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

Feb 19, 2015 | Polaris 2015 Ranger XP 900

2 Answers

Starts and idles but has no power. What might cause this?


Its either needs the fuel system, including professional carb cleaning, or there is a ignition system problem.
Its probably the carb!!!!!

Jul 24, 2014 | Polaris 2011 Sportsman 400 H.O

1 Answer

Engine won't idle /sometimes backfires


Check the MAF-MAP SENCER or it's a throttle position sencer is bad check both by replacing them and see if it works or the last result is idle control valve

Mar 24, 2014 | Polaris 2006 Sportsman 450

1 Answer

2000 polaris 300 2 stroke explorer idles fine but dies on acceleration or backfires when you feather gas to get it to rev up


Main jet in carburetor partially plugged? Has it been sitting a while, probably varnish from old gas. Clean carburetors.

Oct 03, 2013 | ATVs

1 Answer

Idles great but open the throttle it misses and backfires


sounds like you have an air leak on the intake somewhere

Jul 12, 2017 | Polaris ATV

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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