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1999 yamaha wr400 backfires running rough - Yamaha Motorcycles

Posted by Anonymous on

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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 check for spark leakage in the dark.
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.
YZ400F backfires wont idle dies YZ 400 426 450
WR400 backfiring
YAMAHA WR400F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-wr-owners-manuals

Posted on Dec 16, 2016

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

fastboyz
  • 674 Answers

SOURCE: size in msize in mm of a yamahm of a yamaha wr400 standard piston

92x60.1
12.5 to 1 comp

Posted on Jan 02, 2009

  • 17 Answers

SOURCE: 1999 VN800A runs rough and backfires at high RPM.

if it lives above 4000 ft then it will need re-jetting.
Is it stock or does it have a dynojet kit? If dynojet then you need the DJ130 main jet.

Posted on Jun 17, 2009

  • 1 Answer

SOURCE: Runs Rough and backfires

tappet setting for 250 cc yamaha special

Posted on Jul 17, 2011

lt5luke
  • 1 Answer

SOURCE: wr400 yamaha runs but stalls

Check the carb. If it bogs, it could be running lean. If it stalls, it could be an electrical issue. For the carb if it is stock I would recommend a jet kit.
JD Jetting Dirt Bike Jet Kits

Posted on Jan 08, 2012

  • 3799 Answers

SOURCE: 81 honda accord runs real rough and backfiring out of carb

That is a car not a motorbike. Bikes only have 2 wheels. But you may want to set up the cam and ignition timing. it is only timing that will cause backfires.

Posted on May 28, 2012

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Hi, Azurak69er 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 check for spark leakage in the dark.
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.
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Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. 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.
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Hi, Anonymous and the usual suspects are:
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2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
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For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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Hi, Anonymous yes they can for more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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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 "WARNING" you can have 12.5 volts or better but little or zero amps and the battery must be replaced.
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 check for spark leakage in the dark.
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 blue links below. Good luck and have a wonderful day.
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1999 VN800A runs rough and backfires at high RPM.


if it lives above 4000 ft then it will need re-jetting.
Is it stock or does it have a dynojet kit? If dynojet then you need the DJ130 main jet.

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