Question about 2004 Yamaha YZ 450 F

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I have a 2004 yfz 450 that i just rebuilt but it has always backfired when in neutral or when i clutch it my buddy tells me it is prolly jetted wrong what do u think i should do, i havent tried to switch the jet or anything yet but i was wondering what else it could be

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Check sparkplug gap..
If the bike runs okay other than backfire try clean carb or take it off an get a pro to do this . It could be a very cheap fix..Worked for me..
Hope this works

Posted on Aug 22, 2010

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When I pull my clutch in on my yfz 450 it's not engaging it has a brand new cable and lever an a Henson racing clutch on it can anyone help me out here?


When you PULL the clutch lever in, it DISENGAGES the clutch separating the engine drive to the gears.

There are adjustments on the clutch bearing itself and then in the cable. The cable should have about an eighth to a quarter inch of free play at the lever.

Check out these three videos.

YFZ450 Clutch Mods - YouTube

alt="Video for clutch in on my yfz 450">? 6:59 https://www.youtube.com/watch?v=xp3pYX0SE9g Jan 18, 2010 - Uploaded by Tooextrememx How to improve your clutch responce on your YFZ450 with a few quick mods.

Yfz 450 problem - YouTube

alt="Video for clutch in on my yfz 450">? 1:43 https://www.youtube.com/watch?v=8A9X7-tZZAU Apr 22, 2012 - Uploaded by justinncherish Cutting off when clutch is released when in gear. ... I have a question, on my yfz 450 every time I ride my ...

Clutch gripping problem Or Adjustment LTZ400


Jan 18, 2016 | Motorcycles

1 Answer

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

1 Answer

My 2004 yfz 450 wont start i changed plug and stator still wont start you can hear lil backfire from pipe when trying to crank


Hi,
Did you tried replacing the CDi for your bike?
Tell me what happen when you replace or borrow a CDi from your friend, just to check if it is the real culprit......

Sep 30, 2011 | 2004 Yamaha YZ 450 F

1 Answer

Every time I start my yfz 450 I hit the throttle it hesitates when it starts then pops I bit doesn't seem to have the power that it should. I replaced the air filter and the main jet and pilot jet however...


Can you adjust the main jet? Have you cleaned the varible jet or slide? What shape is the vacumn diaphram in? Have you checked the ignition timing,i presume it is solid state ignition?
How about the carb did you clean any with gummout?

Sep 06, 2010 | 2004 Yamaha YZ 450 F

1 Answer

04 yz 450 backfires and is hard to start when is cold runs better with choke on


Runs better with choke means the mixture is lean,
Has the exhaust been changed.?
Did this problem just begin.?
Check for air leaks on intake manifold.
Clean carb.
Check valve clearances
raise the needle jet one notch
one size up in the main jet.

check one item at a time, and write notes about jetting changes.and improvements
I also run Moreys upper cylnder lube, helps starting hot or cold, and helps stop "cough stopping" with heavy rear brake use

May 20, 2010 | 2004 Yamaha YZ 450 F

1 Answer

Well my yfz 450 sat in my shed over the winter so i drain the tank and clean the carb. Then i went to start it and it wouldnt fire up. I took it apart and check it for spark from the coil and didnt have...


the ignition cant fail from sitting, perhaps the kill switch has corrroded, always put a spark plug in and ground it to the head when checking for spark , also check with a new spark plug

May 15, 2010 | 2004 Yamaha YZ 450 F

2 Answers

Hard to start backfire and gets hot quick but ran


If it gets hot quick, could have a problem with the cooling system, blocked radiator,leaks?
Pressure test radiator and cooling system.
They will backfire if they get too hot.
If its just been rebuilt, check head bolts, valve clearances

Apr 15, 2010 | 2004 Yamaha YZ 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

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