Question about 2004 Yamaha YZ 250 F

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Exhaust gets read hot on my 2004 yz250f - 2004 Yamaha YZ 250 F

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It sounds like a lean condition
usualy caused by a dirty carb.
or a vacuume leak

Posted on Apr 19, 2009

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Manual yz250f


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Yamaha YZ250F 2008 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
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Jan 26, 2014 | 2004 Yamaha YZ 250 F

1 Answer

Hard to start Yamaha yz250f hot


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
04 yz250f wont start when hot WR YZ 250F
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YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 28, 2013 | 2004 Yamaha YZ 250 F

1 Answer

Why does my 2006 yz250f backfire when I let off the throttle?


Hi, Anonymous popping or backfiring on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec. Coughing is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals. Spitting is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean. 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
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Yamaha YZ250F 2008 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 19, 2013 | 2004 Yamaha YZ 250 F

1 Answer

Why does my 04 yz250f run to hot


Hi, Anonymous and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant and needs bleeding.
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
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YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Apr 04, 2012 | 2004 Yamaha YZ 250 F

1 Answer

My 2005 yz250f will not idle and backfires on decel. i have cleaned carb and all jets even replaced pilot jet. I tried turning the fuel screw in and out slowly with no positive result.


check valve clearances first. will cause backfire and ide probs
a leaking exhaust gasket or low ignition voltage will cause backfire

Nov 16, 2010 | 2004 Yamaha YZ 250 F

2 Answers

Is the exhaust pipe on a yamaha yz250f suppose to be bright red after running it?


ONLY if you painted it with bright red exhaust heat paint.. get it serviced before you damage your bike,.

Jul 07, 2010 | Yamaha YZ 250 F Motorcycles

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

YZ250F is back firing when let off the throttle. Would hot start sticking cause this problem?


no buddy your mixture is too rich which means to much fuel is going in and not enough being burnt so the access fuel goes in the exhaust and then gets burnt in the exhaust which is a explosion so you get a back fire to cure this problem you need to screw the mixture screw in which is located on the carb a picture below will demonstrate turn this screw 1/4 of a turns in this will decrease the amount of fuel going in and stop backfiring good luck budbe6e0ee.jpg

Aug 30, 2009 | 2004 Yamaha YZ 250 F

1 Answer

Back firing and getting red hot


your either too lean on your fuel air mix screw or your jetting is off

May 05, 2009 | 2004 Yamaha YZ 250 F

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