Oil capacity

Hello folks I have a 2009 yz450f and I did an oil change yesterday an when I drained the old oil I didn't get nearly as much old oil as the bike is soppose to take 1.0l and maybe got less then half a quart I'm running 10w40 yamalube and it's recommend 20w50 but the guy that adjusted my valves said 10w40 is fine to run right now it's in the 60's where I'm from I run cam 2 100. Fuel any idea what this could be? Thanks you.

Ive only changed oil once so far on my 06 but there are 2 drain plugs you need to remove. If I were you I'd check the common threads for the oil change procedure. Also there is a link to download the manual

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