Question about 2001 Yamaha YZ 426 F

1 Answer

I have a 2001 yamaha yz426f that backfires after start and shoots flame from exaust and the exaust gets so hot it glows red.

When i bought the bike it started and ran fine i got it home and started it and it was backfiring and shooting flames out of the exauste and the exauste pipe was so hot it was glowing red

Posted by Anonymous on

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1 Answer

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  • Yamaha Master
  • 43,042 Answers

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.
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.
http://www.raptorforum.com/forums/66-raptor-660-maintenance/71417-just-cleaned-carb-now-exhaust-getting-red-hot-after-idling-only-2min.html
YZ 426 RED hot header pipe backfiring YZ 400 426 450
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

Posted on Aug 02, 2016

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6 Suggested Answers

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Posted on Jan 02, 2017

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cape cod bob
  • 292 Answers

SOURCE: exhaust glows red

sounds like it's running too lean, could be **** in the carb starving it of fuel. remove air cleaner and spray a bunch of carb cleaner in and let it sit overnight, or take carb off and strip it and clean

Posted on Apr 08, 2009

  • 1 Answer

SOURCE: bike backfires and at an idle it shoots out a blue flame

Purchase a EFI controller. I suggest a Fi2000R. It is easy to hook up and fairly easy to set by the instructions.

Posted on Aug 20, 2009

sisadsl
  • 1508 Answers

SOURCE: Glowing RED exhaust pipe

try a bigger jet or its going to cause some damage. You can pull the choke on to get some more fuel in to cool it .
Check that the cam timing hasnt been played with, some change the exaust cam by a tooth to copy yz specs, on top dead centre, there is a little arrow on each cam that lines up with the rocker cover surface

Posted on May 18, 2010

  • 31 Answers

SOURCE: 2006 TTR250. Bike will not idle unless choke is

two things you have to oberved. Choke is only applicable if you experience hard starting in the morning,If yes then use choke for a while till you got your motor idling stage.the glowing red hot indicates that your engine is flaming hot, this means your choke is steadily on.( never stay your choke steadily on.).Try to clean your carb , carb cleaner will do. even without dismantling your carb from the engine manifold.Rev your throttle and spray through the air intake, you'll notice a foul sound bcoz the cleaner is mixing with your gas,it's fine.also you'll notice a black smoke while doing a full rev. it's also fine , thats the carbon that need to push out from your carb. take it from there my friend ...let me know the result.observed your bike

Posted on May 26, 2010

  • 4 Answers

SOURCE: Backfire

is it a straight thru exhaust, or is it just a head pipe with nothing attached? If it's just a head pipe, you need to get some sort of muffler on it or you'll burn your valves out from a lean condition. The backfire is due to the vaccum fed carbs that yamaha runs. They work wonderfully, but under heavy deceleration, the vaccum still feeds the bowl, and it builds up excess fuel, which eventually burns off as a backfire. If it were fuel injected, you could have the fuel map adjusted to lean it out under deceleration.

Posted on Jun 22, 2010

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My exhaust temp is extreamely high like the bike has a lean condition what does the jet setting need to be? On my 2001 yamaha yz426f. ,


jetting would be 45 pilot and 165 main jet but this changes dramatically depending what altitude you ride at - you might want to check your fuel air screw it should be 1.5 to 2.5 turns out from fully closed
If you are running to lean you will get a very big clue when you ride it the bike will backfire, pop and crackle every time you come off the throttle.
Also might be worth mentioning your header pipe on any YZ four stroke will always glow red especially when bike is idling. These YZ's are deigned for only one thing go hard and fast which gives them heaps of air flow for cooling but if you notice your header red when you pull over or leave it idling minute or two then thats pretty normal
Cheers mate let me know if you want more info etc... Good Luck!

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2006 TTR250. Bike will not idle unless choke is fully engaged. After a minute or less of this the head pipe (the one that comes right off the block, I don't know if I have the name right) becomes glowing...


two things you have to oberved. Choke is only applicable if you experience hard starting in the morning,If yes then use choke for a while till you got your motor idling stage.the glowing red hot indicates that your engine is flaming hot, this means your choke is steadily on.( never stay your choke steadily on.).Try to clean your carb , carb cleaner will do. even without dismantling your carb from the engine manifold.Rev your throttle and spray through the air intake, you'll notice a foul sound bcoz the cleaner is mixing with your gas,it's fine.also you'll notice a black smoke while doing a full rev. it's also fine , thats the carbon that need to push out from your carb. take it from there my friend ...let me know the result.observed your bike

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Glowing RED exhaust pipe


try a bigger jet or its going to cause some damage. You can pull the choke on to get some more fuel in to cool it .
Check that the cam timing hasnt been played with, some change the exaust cam by a tooth to copy yz specs, on top dead centre, there is a little arrow on each cam that lines up with the rocker cover surface

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