Question about 2003 Yamaha WR 450 F
Yamaha wr450 2003 with battery start, but 10 seconds later off. no battery no spark
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
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Posted on Jan 02, 2017
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
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
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 >
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Posted on Aug 18, 2010
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