Question about Yamaha YZ 450 F Motorcycles

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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?

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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.

Posted on Mar 22, 2011


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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
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha

Aug 08, 2013 | 2004 Yamaha YZ 450 F

1 Answer

Grizzly 350 wont fire

First check the fuses.check the start ,run switch,there should b some kind of protection for this..possibley a in line fuse??

Aug 07, 2012 | Yamaha Grizzly 350 4x4 07 Airbox Air Box

1 Answer

Hello my name is ryan< i have a yamaha yfz 450r

carb needs cleanin or jet ajustment-pros shud do this cause too lean or rich will make engine damage--buy a clymer manual for details

May 11, 2011 | 2008 Yamaha yZ450F

1 Answer

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

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

Sep 29, 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

I have 04 yfz 450 and its overheating.I start it let it idle for 5mins and its overheating I no the coolant is circulating there is no water in the oil

Headgasket leak?If you have not done so already try filling up the rad(when cold) and run the engine with the rad cap off and look for air bubbles, or you could go to a radiator service centre to check for carbon monoxide in the rad.

Please get back to me if you require further asssistance.

May 26, 2010 | 2004 Yamaha YZ 450 F

1 Answer

Hi my name is martin, i have a yfz 450 race quadbike, when i start it, it wont tick over without choke still on, & then it struggles to tick over ?

Sounds like an air leak between the carby and motor.
Start the motor and spray around in that area with a garden hose while it is running.
When you hose the air leak, it will change the behavior of the motor and you will know where to start looking.
You may need a new inlet rubber, some silastic, maybe an "O" ring, once you find the general area you can investigate for a small leak around there.
Commonly the rubber"hose" between the carby and motor has gone hard &/or cracked, often underneath where you can't see it.

Oct 15, 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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