Question about 2004 Yamaha YZ 450 F

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Carburetor adjustments yamaha 450yfz 2004

I need to adjust carburetor and need the turns for the screws on my Yamaha 450 yfz 2004/2005 I would also like a diagram is possible. Thank you Brian

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  • Anonymous Mar 30, 2014

    how to adjust idle

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Turn both the air screw and throttle screw inward until they LIGHTLY seat. Now back each one outward one and one half turns. This is the factory setting. I am going to give you a web site where you can download a free PDF factory service manual for a YZ450FR. I believe the model is a bit different but the carbs are the same.

Go to this site and you can download a free PDF service manual. The site may take up to 25 seconds to fully load the list of manuals. It is worth the wait. www.carlsalter.com/motorcycle-manuals.asp The service procedures are there in detail and a lot of diagrams and photos. Don't mess with the pilot screw unless you have to, Part #11 in the diagram.
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Posted on Sep 06, 2009

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Part 11 is the Air mixture screw, 2 1/2 turns is what mine took to run like it should. 45 idle or pilot jet is what I had to change to. The guy I bought he quad from never drained the carb bowl when not in use. If you let that fuel sit in the bowl it will cause issues, the fuel will evaporate and the crud is left behind to plug up the jets and cause issues with the float needle. I drain it if its going to sit more than a week.
Turn your Pet Cock valve off then either start the quad and let it run until it stalls or drain the carb bowl by backing out the Allen screw on the left side of the carb at the bottom of the bowl, fuel will run out so catch it with something ( coffee can).

Posted on Feb 16, 2013

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98 yzf 400 wont idle

Posted on Sep 25, 2011

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1 half turn, get the bike running, go back until it tries to die, go forward until it tries to die, adjust to the middle of that. Factory.

Posted on Mar 04, 2015

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More then likely if your having carburator problems its nothing to do with the adjustments. In the past few years i've found the most common problem is that people are using fuel with ETHANOL in it which will cause nothing but problems internally to the fuel system. Ive seen the inside of a carb turn green from ethanol and plug the tiny holes in the pilot jet after only being parked for 2 weeks.

Posted on Sep 13, 2014

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Hi, Anonymous and the usual suspects are:
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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http://www.r1-forum.com/forums/4-mechanical-help/110266-help-yfz-450-will-not-idle-correctly.html
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Hi, Anonymous and the usual suspects are:
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4. Faulty accelerator pump.
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6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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