Question about 2003 Yamaha WR 450 F

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2003 Yamaha wr450 no spark

Yamaha wr450 2003 with battery start, but 10 seconds later off. no battery no spark

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Hi, Jctumen and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
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.
no spark on 2003 wr450f
How to fix No Spark Problem on Motorcycles and Dirt Bikes
YAMAHA WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Posted on May 24, 2017

5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: On Yamaha wr450 dirt bike the exhaust pipe gets

Sounds like you are running waaayyy too lean. Aftermarket intake/air filter/exhaust?

Posted on Apr 19, 2009

  • 7 Answers

SOURCE: my yamaha wr450 just stopped on me and will not start

Not sure of the gaps, was your bike full on oil before your ride? Full on coolent? If either of these were low that could be bad. It also could be a crank bearing, i spun one on my bike and it scattered throughout the crank case. I'd inspect the oil, the coolent, and then also note any grinding or anything if there is any when you try to start it up. This will give you a better indication of what angle to pursue in diagnosing the problem.

Posted on Nov 19, 2009

  • 22 Answers

SOURCE: 2001 yamaha breeze wont stay running

i had the same issue. it's gonna be a blockage in one of the vent tubes to the carb. check the line to the left of the carb that runs next to the gas tank. if thats fine then check the gas cap line. then if thats all good then check the line that runs below the carb. these are all vent tubes and allow the carb. to refill with fuel

Posted on Aug 07, 2010

  • 3567 Answers

SOURCE: wat is the correct spark plug to use for a 2003

The stock plug is NGK brand, CR8E (resistor plug)
If you would like to have a factory service manual for your bike, You can do a free download at the following website >
www.carlsalter.com/motorcycle-manuals.asp
Please rate my answer. Thanks!

Posted on Aug 18, 2010

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1 Answer

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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 $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, Gerard 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. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system, carburetor and/or filter.
12. Old dead or bad fuel.
13. Fuel tank vent system plugged or carburetor vent line closed off.
14. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
15. Carburetor controls misadjusted.
16. Damaged carburetor.
17. Incorrect valve timing.
18. Weak or broken valve springs.
19. Damaged intake or exhaust valve.
20. Check for engine trouble codes
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Jul 10, 2013 | 2007 Yamaha WR 450 F

1 Answer

Yamaha wr450 battery wont recharge


If the battery is completely dead you can go to autozone and get acid refills. The levels can sometimes get low. However, it sounds to me like you would be better off buying a new battery.

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Need wiring diagram 2004 wr450


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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2006 wr450 red hot exhaust plus rough idle plus backfire on deceleration


Hi, Mark 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 blue links below. Good luck and have a wonderful day.
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1 Answer

Wat is the correct spark plug to use for a 2003 wr450


The stock plug is NGK brand, CR8E (resistor plug)
If you would like to have a factory service manual for your bike, You can do a free download at the following website >
www.carlsalter.com/motorcycle-manuals.asp
Please rate my answer. Thanks!

Aug 18, 2010 | 2003 Yamaha WR 450 F

1 Answer

2005 Yamaha WR450f no spark


Hi, Sumobiker and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
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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May 31, 2009 | 2005 Yamaha WR 450 F

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