Question about 2003 Yamaha WR 250 F

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2001 WR250F WILL NOT IDLE AND BACKFIRES ON DECEL. AND SPITS/SPUTTERS WHEN THROTTLE IS APPLIED WHEN UNDER LOAD

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These symptoms usually point toward lean on fuel for some reason
most common would be dirty or gummed pilot circuit and pilot jet I would remove carb and take out the pilot jet clean or replace with new - blow compressed air through the hole the pilot jet came out before reinstall
depending what altitude you are a bigger size pilot jet may assist this issue also but clean and replace original pilot jet and circuit first to confirm

Posted on May 25, 2011

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Posted on Jan 02, 2017

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1 Answer

Backfiring on decel


If this is a new condition and you've not worked on the bike recently, I'd try a dose of StarTron in the gas tank. It will eat the sludge that grows in fuel systems exposed to gasohol. Put it in the tank, ride a few miles to get it into the carbs, and then let it sit overnight. It has special enzymes in it that do the job. Seafoam is a good product but is not designed to clear bacterial sludge.

Apr 10, 2014 | 2005 Suzuki Boulevard C90T

1 Answer

My 2001 vw beetle spits and sputters and backfires when I give it gas will idle fine.


You need to have a diagnostic done on it - I would suspect the throttle position sensor ( TPS) but there are other sensors that could cause this too. getting a diagnostic done will save you a lot of money and time. Many auto parts stores and shops can do this for a nominal fee or even free, if you can get it there. if you cannot drive it there ( idling along is so slow) call around and find a shop that can diagnose and repair it. Most of the newer VWs require very vehicle specific equipment to diagnose, so make sure they are equipped for VWs.
Hope this helps and thanks for using Fixya!

Nov 02, 2013 | 2001 Volkswagen Beetle

1 Answer

Stalls in drive, runs grear in reverse


Engine stalling and rough run issue at low speeds

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

Jul 06, 2012 | Cars & Trucks

1 Answer

Starts but takes a very long time to warm up. continually stalls when throttle applied. have to keep feathering throttle to keep running . spits ,sputters , backfires until fully warmed up


ColdI engines require a richer mixture to operate smoothly...so they have an enricher (aka choke).
If you are finding you need to keep the choke on longer.....you may have a lean mixture than normal.nother
Start by inspecting the carb and intake manifolds for any leaks (loose fittings....cracked hoses) that could be drawing in air, leaning the mixture.

Another common issue with bikes that have sat over winter...is plugged idle jets.....the fuel varnishes the tiny orifices in the carb. You could try a product like Seafoam in the fuel tank....run it abit to get the treated fuel in the carbs then let it sit overnight...allowing time for the chemical to work. Since the bike runs fine warm...this may clear things up for you.

Apr 05, 2011 | 2000 Yamaha V Star 1100 Classic

1 Answer

1999 lumina 3100 spits sputters and backfires out throttle body


You need to get the codes read to verify,but i think your in need of coil pack or wires.

Oct 23, 2009 | 1999 Chevrolet Lumina

2 Answers

Spits sputters and backfires


carborator needs to be cleaned and the float needs to be reset

Aug 23, 2009 | 2004 Harley Davidson XL 883 Sportster

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