Question about 2005 Yamaha yZ 250

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2005 yz250f header pipe getting red hot and will not idle without choke on

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Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
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.
Dirt Rider Magazine
YZ250F won idle without choke solved Intake Jetting Fuel Injection
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 25, 2016

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Posted on Jan 02, 2017

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landsend
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SOURCE: 2006 yz250f header is glowing at idle, has not done this before.

combustion chamber is tooooo hot.  Mixture is way to lean

Posted on Mar 22, 2009

tabbycat282
  • 56 Answers

SOURCE: my yz250f is running real hot and wont idle wright

Check the valve clearances and timing and for any air leaks around the intake manifold....Good luck matt .

Posted on Nov 22, 2009

  • 677 Answers

SOURCE: 04 yz250f pipe at motor glowing red hot

Any reason you had to change the jetting??New pipe,Intakes.?But,even though you may have it a bit rich on idle the pipes WILL get very hot,very quickly without some sort of air flow over the front of the motor and radiator.At the very least,have a strong fan blowing directly on the front of the motor if you are going to let the bike run and you are not riding it.I have seen the white plastics in front of the radiator distort from the radiant heat.Don't idle them for in more then 20 seconds.It can do heaps of damage.Ride the bike and see if its running well.When you stop,turn it off.All the yz and wrf will get very hot at idle.Hope this helps

Posted on Jan 17, 2010

heimlich
  • 1978 Answers

SOURCE: my header pipe on my

If you have changed the jets you may have to try a different size. I suspect that the pipe is getting red hot from to much fuel . I think your problem is the choke. It may be sticking, have a bad plunger, or may not be closing all the way. Start your inspection there.

Posted on Dec 13, 2010

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1 Answer

Why won't my 2005 yz250f run without the choke on


Hi, James and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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YAMAHA YZ250F LC Owner Service Manual
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Jun 12, 2012 | 2005 Yamaha yZ 250 F

1 Answer

My header pipe on my 2003 yz250f gets cherry red hot when i start it up real quick do i need to change air filter, spark plug, valve adjustment, or get the carb rejetted thanks


If you have changed the jets you may have to try a different size. I suspect that the pipe is getting red hot from to much fuel . I think your problem is the choke. It may be sticking, have a bad plunger, or may not be closing all the way. Start your inspection there.

Dec 13, 2010 | 2004 Yamaha YZ 250 F

1 Answer

I just rebuilt my motor on my yz250f and the pipe is still glowing red what should i do?


Thats a sign of being rich, keep in mind that all of my four strokes will glow red at the header pipe while the choke is on.

Mar 06, 2010 | 2003 Yamaha YZ 250 F

1 Answer

04 yz250f pipe at motor glowing red hot


Any reason you had to change the jetting??New pipe,Intakes.?But,even though you may have it a bit rich on idle the pipes WILL get very hot,very quickly without some sort of air flow over the front of the motor and radiator.At the very least,have a strong fan blowing directly on the front of the motor if you are going to let the bike run and you are not riding it.I have seen the white plastics in front of the radiator distort from the radiant heat.Don't idle them for in more then 20 seconds.It can do heaps of damage.Ride the bike and see if its running well.When you stop,turn it off.All the yz and wrf will get very hot at idle.Hope this helps

Jan 17, 2010 | 2004 Yamaha YZ 250 F

1 Answer

My yz250f is running real hot and wont idle wright


Check the valve clearances and timing and for any air leaks around the intake manifold....Good luck matt .

Nov 21, 2009 | 2003 Yamaha YZ 250

1 Answer

2006 yz250f header is glowing at idle, has not done this before.


combustion chamber is tooooo hot.  Mixture is way to lean

Mar 21, 2009 | Yamaha YZ 250 F Motorcycles

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