Question about 2001 Yamaha WR 426 F

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It depends you might of just had a bit much oil in it. if it back fires on acceleration its more than likely going to be [a spark brake down] or [timing is out] or not [getting the right voltage]voltage reg ,pick up coil,CDI unit,coil or Ignition lead spark cap, plug.If on de accell jetting check for after market pipe jetting is a good start there. Lastly Check valve clearence you can do this in any order you will find your answer

Posted on Aug 27, 2011

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I have a 80-81 Cdi on a 82 xlh, do I need to advance or retard to make it work? It runs but backfires

Hi, Barry if it is just the timing you need to advance it and check it with a timing light otherwise the usual suspects are:
1. A severely drained battery.
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.
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Backfires and stumbles when gas pedal is floored

There are a lot of diffferent things possible, the backfiring is usually caused by a timing issue. Which could also cause some of your loss of power, but not always. Try checking your fuel pressure to see if there is a clog, also your timing is computer controlled so this means your timing chain is worn spark plugs and wires could be bad or you have a cracked distributor cap rotor bug bad, or even a bad distributor or even as simple as wrong ground placement for motor. Best choice is to start small and then work your way up. Also if disributor has ever been taken out then you will have to reset your oil pump drive because your distributor runs your oil pump with your cam-shaft.

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Honda makes quite good gasoline motors. I doubt it is a valve timing issue but it might be a burned valve or a valve adjustment issue. What does after a while mean? A couple of minutes or 4 hours? Is it running for just a short while and then stops or it runs well for a long time and then stops?

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My 2001 dodge durango dies right down when started even hot or cold it back fires i have changed the sensors it does this in open loop to closed loop

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How to change oil on my yamaha wr450

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1 Answer


change plugs and rebuild carbs.

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