07 yz450f Engine oil capacity

I bought a yz450 without the owners manual my question is how much oil does it take to do a complete oil change I did a research and I'm finding different capacities some guys say 1.2L others says 1quart can someone help me?

most people that I knew who were running those back then were just dumping a quart in them and calling it done. Lots of hours and pretty good riders too who weren't easy on the bikes.

Thanks for the help

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