Oil capacity yz450f 2004 - 2004 Yamaha YZ 450 F

SOURCE: fork oil capacity for 2004 yz450f

Use a good 5-7 wt fork oil and set the level at 100mm.
I hope this helps and good luck. Please vote accordingly and leave a message.

SOURCE: fork oil level

Forks can get pretty complicated. If they have been worked on it is not just re-filling with oil to a certain level. That would be the case if the seals leak a bit and all you are doing is adding oil to replace what has gotten past the seals. I am giving you a site where you can download a free factory service manual. Everything on servicing the forks and the rest of the bike is in the manual. There is a 2003 manual on the site. Your 2004 forks are the same as the 2003. All other service procedures are also the same. Go to this site and you can download a free PDF service manual. The site may take up to 20 seconds to load the complete list of manuals. Please rate my answer. Thanks!
www.carlsalter.com/motorcycle-manuals.asp

SOURCE: oil capacity 2008 yz450f

I believe the engine and transmission are shared, using the same oil.
You should have a sight glass on the left side, and it should be checked after a warm up, and then sit for a couple of minutes. I think it's close to a quart and a half.

SOURCE: what are the Valve clearances for a 2004 yamaha yz450f

Valve clearance (cold):

Intake:
0.10 ~ 0.15 mm (0.0039 ~ 0.0059 in.)

Exhaust:
0.20 ~ 0.25 mm (0.0079 ~ 0.0098 in.)

SOURCE: How much oil does a 2004 yamaha yz450f take?

It should take no more than about 2-4 bottles but if you want put a bottle in at a time and check the side glass of the motor and stand the bike straight to see were the level is, it should be at half or even a bit over is fine but no less, if one bottle doesnt do it then add another and another till it does but one bottle at a time.