Question about 2004 Yamaha YZ 450 F

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How do i get my idle down on yamaha yfz 450 quad

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Turn the idle screw anticlockwise half to one turn to set if this does not affect idle speed then you need to look further inside carbi or intake valves for other issues

Posted on Jun 03, 2011

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Posted on Jan 02, 2017

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I have a 2004 Yamaha YFZ 450 the bike will start and drive but as soon as it warms up when you push the throttle it starts to cut out... What is the problem?


There is not really enough info in your post to narrow down the problem. Hesitation during acceleration can either be fuel related or ignition timing related. Once up to speed, will it maintain that speed smoothly?

If you have a timing light, check the timing at idle. If it is OK, then it is probably fuel related.

Assuming you have not messed with the ignition timing, if it idles, but won't accelerate, it is probably starved for fuel. 1.Check/change the fuel filter- easy and cheap
2. pull the fuel line off the carb, and make sure fuel flows from the tank freely.
3. If there is good fuel flow to the carbs, pull the carbs and clean them.

Sep 30, 2013 | Yamaha 06 Yfz450 Yfz 450 Carburetor Carb...

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I have a 2004 yfz 450 that wont idle, not sure why anymore


Hi, Anonymous and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
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.
mean YFZ won idle
http://www.r1-forum.com/forums/4-mechanical-help/110266-help-yfz-450-will-not-idle-correctly.html
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Aug 08, 2013 | 2004 Yamaha YZ 450 F

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Run my yamaha yfz 450 2007 with no water as it leaked and i didint realise now the quad wont start and i have no compression any ideas?


A bunch of things could be the problem >> valves scalded and stuck partly open, Rings seized to the piston, scored cylinder walls blown cylinder head gasket and warped cylinder head.

Mar 22, 2011 | Yamaha YZ 450 F Motorcycles

1 Answer

My yfz 450 yamaha 4 wheeler runs great in 1/2 choke, but when i put it down to idle it starts to miss and dies, I have replaced all of the carb and I am getting ready to asemble everything, the one thing I...


start about 2 turns out.
while idling when you screw it in a bout half a turn the bike will begin to bog down (rich)
as you screw it out the revs will increase and become uneven(lean)
pick a point between the two where the idle is smoothest.
this setting can change with different engine tempuratures, and altitude

Dec 17, 2010 | 2004 Yamaha YZ 450 F

1 Answer

Yfz 450 cuts out


sounds like fuel starvation,check fuel tap filter, if the valve tining or ignition timing was out it just wront run

Jul 05, 2010 | 2005 Yamaha WR 450 F

1 Answer

Timing on 06 yamaha yfz 450


Here is the SERVICE MANUAL for your bike.

http://pdfdatabase.com/download_file_i.php?file=14074911&desc=Yamaha+YZ450F+Service+Manual+.pdf

Dec 25, 2009 | 2004 Yamaha YZ 450 F

1 Answer

04 yfz 450 wont start with electrical start


i have a 04 yfz 450 quad. the compression ratio like yours is extremely high. ive had my battery go bad and found that another battery other than factory would turn over the engine, but would not start. i paid the 100 dollars for the factory battery and it fired right up. because of the high compression you need a high cranking battery.

May 04, 2009 | 2004 Yamaha YZ 450 F

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