Question about 2002 Yamaha YZ 426 F

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I have a yzf426 it eats plugs about every 20 mins and the header pipe glows like the sun after about 5 mins of riding evey time the plug dies its covered in black dry stuff when i put a new plug in a cr8e ngk always the plug i use it pops and farts and stalls unless i keep revs up and when i rev it pops shoting flames out the tailpipe

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The timing is way out or the motor is running very rich.Get these things looked at and you should be ok

Posted on Oct 03, 2010

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I have a 2004 wrf 450 r it runs fine but after about 5 mins the pipe glows red how can I fix it...


Hi, Anonymous a WR is an Enduro bike designed to run flat out that being said if you are strolling down some scenic trail at a slow pace or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. 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.
Header pipe glowing RED WR 400 426 450
Yamaha WR450FR Owner Service Manual
OEM parts for Yamaha
Yamaha wr450fb Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Oct 12, 2016 | Yamaha WR 450 F Motorcycles

1 Answer

2005 Kawasaki KX 250 exhaust pipe glows red


Hi, Anonymous and the usual suspects are:
1. Retarded ignition timing.
2. Retarded cam timing.
3. Bent or burnt exhaust valve.
4. Massive air leak.
5. Intake manifold cracked or damaged.
6. Intake manifold seals have failed.
7. Wrong heat range spark plug.
8. Fuel delivery system running too lean.
9. Faulty Map, O2, MAF, TPS, sensors.
10. Faulty advance mechanism.
11. Faulty VOES switch.
12. Aftermarket exhaust headers tubing too thin.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
KX250F Header pipe RED HOT
https://www.kawasakiforums.com/forum/klx-250s-71/exhaust-header-glowing-red-hot-31298
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX-125-KX250-Service-Manual-2003-2004-2005-2006-2007-2008.pdf
OEM Parts for Kawasaki
2005 Kawasaki KX250 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jan 01, 2014 | 2005 kawasaki KX 250

1 Answer

2003 Kawasaki KX 250 exhaust glows red hot


Hi, Anonymous and the usual suspects are:
1. Retarded ignition timing.
2. Retarded cam timing.
3. Bent or burnt exhaust valve.
4. Massive air leak.
5. Intake manifold cracked or damaged.
6. Intake manifold seals have failed.
7. Wrong heat range spark plug.
8. Fuel delivery system running too lean.
9. Faulty Map, O2, MAF, TPS, sensors.
10. Faulty advance mechanism.
11. Faulty VOES switch.
12. Aftermarket exhaust headers tubing too thin.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://motocrosshideout.com/2012/06/17/is-a-glowing-red-head-pipe-okay
KX250F Header pipe RED HOT
OEM Parts for Kawasaki
2003 Kawasaki KX250 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jan 01, 2014 | 2003 kawasaki KX 250

1 Answer

I have a Kawasaki zephyr 750 after I cleaned carbs the header glows red after I start it and let it run for a few mins. I put hotter pugs in it last year when I had carb trouble could that be it? (All four...


A hotter plug could cause the piston crown to melt (depending on how much hotter) The reason engine makers give a recommended spark plug is because this grade will give the best performance and efficiency. Try reverting to the correct grade.But the headers glowing red is not unusual as not all header pipes are twin wall tubing.

May 17, 2013 | Motorcycles

1 Answer

2007 Honda 919 exhaust pipes red hot


Hi, Sandy and the usual suspects are:
1. Retarded ignition timing.
2. Retarded cam timing.
3. Bent or burnt exhaust valve.
4. Massive air leak.
5. Intake manifold cracked or damaged.
6. Intake manifold seals have failed.
7. Wrong heat range spark plug.
8. Fuel delivery system running too lean.
9. Faulty Map, O2, MAF, TPS, sensors.
10. Faulty advance mechanism.
11. Faulty VOES switch.
12. Aftermarket exhaust headers tubing too thin.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Exhaust glowing red
http://www.motorcycleforum.com/59-motorcycle-repair/97882-immediately-red-hot-exhaust-pipe-header.html
Honda CB900F Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CB900F Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Sep 14, 2012 | 2007 Honda 919 Base

1 Answer

2006 Kawasaki KX 250 F exhaust glowing cherry red


Hi, Heimjason and the usual suspects are:
1. Retarded ignition timing.
2. Retarded cam timing.
3. Bent or burnt exhaust valve.
4. Massive air leak.
5. Intake manifold cracked or damaged.
6. Intake manifold seals have failed.
7. Wrong heat range spark plug.
8. Fuel delivery system running too lean.
9. Faulty Map, O2, MAF, TPS, sensors.
10. Faulty advance mechanism.
11. Faulty VOES switch.
12. Aftermarket exhaust headers tubing too thin.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
KX250F Header pipe RED HOT
http://motocrosshideout.com/2012/06/17/is-a-glowing-red-head-pipe-okay
http://www.mx-sport.ru/files/servicemanual-KX250f-06.pdf
OEM Parts for Kawasaki
2006 Kawasaki KX250F Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 29, 2012 | 2006 kawasaki KX 250 F

1 Answer

2007 yamaha yz450f... while riding last week it was backfiring on deceleration. it blew a 5 inch hole in the header pipe. i purchased a new one, cleaned the air filter, changed the oil and put a new spark...


Exhaust leaks near the exhaust port can draw air into pipe on deceleration and detonate any unburnt fuel leaving engine, causing backfire and high temps.
An overly lean fuel mixture on the engine can make decel backfire worse too.

Mar 13, 2011 | Yamaha YZ 450 F Motorcycles

1 Answer

1999 Kawasaki VN 1500 Vulcan Classic exhaust glowing red at idle


Hi, Tonysalsaman and the usual suspects are:
1. Retarded ignition timing.
2. Retarded cam timing.
3. Bent or burnt exhaust valve.
4. Massive air leak.
5. Intake manifold cracked or damaged.
6. Intake manifold seals have failed.
7. Wrong heat range spark plug.
8. Fuel delivery system running too lean.
9. Faulty Map, O2, MAF, TPS, sensors.
10. Faulty advance mechanism.
11. Faulty VOES switch.
12. Aftermarket exhaust headers tubing too thin.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
2001 1500 Vulcon Nomad pipes glowing Kawasaki Vulcan Forum Vulcan Forums
https://www.kawasakiforums.com/forum/klx-250s-71/exhaust-header-glowing-red-hot-31298
http://serwer.robert.webd.pl:30/manual/Kawasaki_VN_1500_87'-99_Service_Manual_ENG.pdf
OEM Parts for Kawasaki
2000 Kawasaki Vulcan 1500 Classic Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jan 22, 2011 | 1999 kawasaki VN 1500 Vulcan Classic

1 Answer

I need help with carb adjustments.because when im ride around it runs ok and then it dies out of no where or when i stop my right side of my header glows red


Stalling, won't idle, and glowing header pipes are all symptoms of two possible problems: insufficient valve tappet clearance (adjust the valves), and/or plugged up carburetor from sitting (disassemble the carb and clean it).
Adjust the valves, first - and see if that doesn't solve the problem.

Dec 11, 2009 | 1988 Honda XR 600 R

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