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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

Posted by dianealstrom on

  • Anonymous Mar 30, 2014

    how to adjust idle

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5 Answers

tombones

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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.
Can I get a Very Helpful" rating out of this?

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Posted on Sep 06, 2009

Anonymous

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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

Michael Dowd

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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

Sean Connors

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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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2004 YAMAHA YFZ 450 Quad POPS OVERHEATS BREAKS UP AT HIGH RPM.

Question edited for full 'year make model (what it is).
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Please don't type in all CAPS, it is considered SHOUTING and is harder to read.

'clips' and 'turns' it took me a while to realise you were talking about the carburetor and you were playing with the mixture screw and needle position! 4 turns out is a lot different to the factory setting which is 1 1/2 turns out.

If it is overheating it is running too lean. As you changed the stator, also consider the ignition timing. Popping can also be caused by the ignition failing under load, coil, lead and spark plug.

Carburetor and tuning.

https://www.google.com/search?q=2004+yamaha+yfz+450+carburetor+adjustment

This carb has a LOT of jets!

https://www.amazon.ca/Carburetor-Rebuild-Yamaha-YFZ450-2004-2009/dp/B07JNYP667

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