Question about Yamaha YZ 250 F Motorcycles

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

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No not really, red means very hot

Posted on Jul 07, 2010

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

Posted on Jul 07, 2010

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1 Answer

Red hot exhaust pipe


Hi, Anonymous a YZ is a motocross 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.
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http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Sep 01, 2013 | Yamaha YZ 450 F Motorcycles

1 Answer

Yz250f exhaust pipe glowing red straight away


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.
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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 | Yamaha YZ 250 F Motorcycles

1 Answer

Exhaust pipe turns red hot Yamaha yzf


Hi, Anonymous a YZ is a motocross 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.
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Sep 02, 2012 | 2002 Yamaha YZ 426 F

1 Answer

My 2002 yamaha ttr 225 is running really lean and is really hard to start, and even whenever it does start i have to leave my choke wide open for it to stay running. It runs so lean that my exhaust pipe...


well it is normal for a four strokes exhuast to turn red your not suppose to let them idle for long periods of time. and the running problem is probably the carb i would take it off and clean it before doing anything else could save you money i had the same problem on a yz450f i took the carb off and cleaned it and problem was solved and also run 93 octane gas if your not already

Mar 28, 2011 | 2002 Yamaha TT-R 225

1 Answer

My 2002 yz250f takes a very long time to start, and countless kicks to start it. but one it starts it runs fine untill it tuns off cold and hot verry hard to start.


I would check sthe spark plug gap. Set it to 0.9mm
If too close it won't ignite properly also is the exhaust pipe standard? If not the timing and mixture will need adjusting.
Hope that helps.

Feb 25, 2011 | 2003 Yamaha YZ 250

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

Exhaust gets red


could b obstruction in exhaust put hand couple of inches behind exhaust and rev it up should have good amount of exhaus coming out.if it is no obstruction there check timing

Feb 28, 2009 | 2003 Yamaha YZ 250 F

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