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Wont idle or dies when the throttle is released

Checked fuel pump cleaned screen on fuel pump ran fuel cleaner through fuel system and changed battery wont run at low rpm or dies all togather

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Sounds like the carburetor needs cleaned and or rebuilt. or you could have a vacuum leak..

Posted on Jun 05, 2014

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SOURCE: 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

Posted on Mar 24, 2014

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Fuel system completely flushed carburator completely cleaned, new gas


tank airiation fuel tap filter tankfilter clean? sludge removedl a canister automotive engine cleaner for the fuel are by cleaning carburetor( if there is a L+R re-adjusted) are the gaskets changed and correct placed especially between cilinder and carburetor. there can be especially a small channel in it that it was wrong replaced or is the compression good enough ?
Compression is the very most important thing there is to look at the exhaust site to the piston that must be smooth otherwise there was a problem by overheating piston if there are grooves there can be a wrong adjusting of the carburetor or by a quality problem of the used gas

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1 Answer

Tao-tao 150. It starts and idles fine. When I press on the throttle, why does it die?


A lack of fuel. Obviously the idle/low speed circuit is working inside the carburetor, but the high speed circuit isn't flowing fuel. You need to disassemble the carb and remove the main jet and needle jet and clean the holes in each. Then with some aerosol carb cleaner, blow out all the passageways. If it can get fuel, the motor will accelerate. One final thing to check is the air filter. Clean as necessary.

Oct 31, 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

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1 Answer

360 prairie atv engine does not rev up


If you've rebuilt and adjusted the carbs to the correct spec, and the air fuel mixture is right, it would be worth checking the fuel filter if one is present, as well the fuel pump (again, if present). These are typically the first place to look when you idle fine but die out on throttle.

As for the belt light, it depends on what it indicates. Wear? Tension? If the belt slips, or is too tight or too loose, it could also cause stalling under throttle. With the engine off and cool, check it for cracks, splits and wear, and give it a light tug with two fingers. It should have a small amount of play, but not enough to feel like you could pull it off. If it feels like a steel rod, it may be over tight.

If all of these things are fine, no clogged filters, etc, it's maybe time to look at the distributor, and recheck those carbs.

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2 Answers

Arctic cat 500 dies when you give it gas but idles fine!


You still have a carb issue, doesnt take much trash to chock it out when giving throttle. if you done the carb clean twice, try seafoam, does pretty good at cleaning the carbon out. use it as directed while running. it will smoke bad while preforming this proceedure so dont panic whens it smokes the neighborhood out.

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check your float height? sounds like its high and runs normal when cold like the choke is on but when warm its getting too much fuel.

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Adjust the fuel idle and the accelerator cable.

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