Question about 2001 Yamaha WR 426 F

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How do I change the yamaha WR426 spark plug - 2001 Yamaha WR 426 F

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Normally you have to find it first. duh
Well for start, open your rider seat, at the base of tank should be a big bolt holding the tank to you bike frame, remove bolt, try to lift tank up slowly to make sure all rubber hoses and connections can be released, once done that, lift tank up high enough and proped it up to access your spark plugs wire, hold wires by their boots and pull them off one at a time, meaning, pull one boot off, remove spark plug, put a new one, put boot on, go to next one until all are replaced, make sure all boots are tightly fitted, slowly lower the tank and connect all that have been disconnected, bolt the tank to frame make sure it sits tght, close seat and you are ready again.

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

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SOURCE: I need the number of a spark plug for a wr426

The stock plug isan NGK brand, CR8E

Can I get a “very helpful” rating on this answer?

Posted on Aug 18, 2009

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bigc73542
  • 108 Answers

SOURCE: Really black spark plug on 2002 wr426 irregular

If this bike has a two cycle engine and auto lube or auto mix you might need to have the oil to gas mixture adjusted by a good motorcycle shop. It is not a very expensive adjustment, and running to much oil can carbon up the rings which can damage the cylinder wall.

Posted on May 06, 2009

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Transmission wr 426 2002


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 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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1 Answer

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Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. Check for engine trouble codes.
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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 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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Feb 10, 2013 | 2002 Yamaha WR 426 F

1 Answer

2001 Yamaha WR 426 F no spark


Hi, Jason 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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Inspect your cam chain for wear. try backing off your cam chain tensioner and resetting.

May 24, 2010 | 2002 Yamaha WR 426 F

2 Answers

I need the number of a spark plug for a wr426 yamaha.


The stock plug isan NGK brand, CR8E

Can I get a “very helpful” rating on this answer?

Aug 17, 2009 | 2001 Yamaha WR 426 F

1 Answer

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If this bike has a two cycle engine and auto lube or auto mix you might need to have the oil to gas mixture adjusted by a good motorcycle shop. It is not a very expensive adjustment, and running to much oil can carbon up the rings which can damage the cylinder wall.

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