Question about 2002 Yamaha Xv 250 Virago S

1 Answer

I have a 2007 Virago 250cc that backfires when downshifting. It sounds like a shotgun going off. And it will not keep idling. It is steadelly getting worse every time I ride it.

Posted by Anonymous on

1 Answer

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  • Yamaha Master
  • 39,960 Answers

Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://viragotech.com/newtech/Back%20Fire%20on%20deceleration%20and%20down-shifting%20(Solved).htm
http://viragohelp.com/virago-owners-clubvoc-archives/deceleration-backfiring
http://www.groussin.com/multi/XV250.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2005/LIT-11626-18-21_1000.pdf

Posted on Jul 01, 2016

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 69 Answers

SOURCE: Idle adjustment

your idle adjustment should be some where on the side of your bike, its usually a black cable with a black dial on the end of ot and should be attached to a metal cable/rod and bolted to another part of the bike

Posted on Mar 10, 2009

  • 200 Answers

SOURCE: Yamaha Fazer 600 - keeps breaking against me when riding

I suspect poor fuel delivery or starvation. At those rpms your bike requires a lot of fuel.Replace any and all fuel filters, check fuel lines for any kinks. Drain tank (petcock on pri ) then remove and clean petcock , replace. Run a bottle of techroline thru your next couple tanks of gas....Good Luck to you my friend...Tim

Posted on May 10, 2009

  • 850 Answers

SOURCE: The battery on my 1995 Yamaha Virago 250cc is not working

starter brushes could be worn out or a dirty or loose connection!
Starter button may need checking also the solenoid
week compressin or leaking diaphrams in carbs will cause it too
I suggest you charge battery & start at the button & work your way back

Posted on Jul 17, 2009

  • 5 Answers

SOURCE: 1996 royal star, left rear valve seems to be

The The Air Injection System AIS for that cylinder could be leaking (chrome pipe running up to a fitting right by the exhaust pipe) or more likely the rubber pipe that goes from the engine intake to carburetor is either loose at the engine or carburetor, or the rubber pipe is cracked, split or broken. This would cause air to be sucked into the crack, split or loose fitting during during acceleration or downshifting.

Posted on Aug 28, 2009

Benimur
  • 6966 Answers

SOURCE: have a 250cc yamaha virago its been standing for a

Hi and welcome to FixYa,

Almost always, your described problem indicates clogged idling jets. Stale fuel causes varnish like coating which must be removed. This then calls for a carb pulldown, disassembly and soaking non-rubber parts in carb cleaner. In the exploded carb diagram below, the idle (pilot) jet would be # 20.

467dae4.jpg

Good luck and thank you for asking FixYa.

Posted on Nov 17, 2009

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Hi and welcome to FixYa,

Almost always, your described problem indicates clogged idling jets. Stale fuel causes varnish like coating which must be removed. This then calls for a carb pulldown, disassembly and soaking non-rubber parts in carb cleaner. In the exploded carb diagram below, the idle (pilot) jet would be # 20.

467dae4.jpg

Good luck and thank you for asking FixYa.

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Idle adjustment


your idle adjustment should be some where on the side of your bike, its usually a black cable with a black dial on the end of ot and should be attached to a metal cable/rod and bolted to another part of the bike

Mar 08, 2009 | 2005 Yamaha Xv 250 Virago S

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