2018 Yz450f oil leak

Jan 3, 2021
20
8
3
Hello, I’m having oil leak issues on my 2018 yz450f. Oil is coming out of the black breather tube that comes down from the head. Not a clue why, I did an oil change and went for a little ride to make sure thing were good and I came back and had next to no oil left. All bolts were torqued to spec, oil filter wasn’t plugged or the oil strainer. And I put in the 900ml of oil the service manual calls for, so it’s not dripping excess oil. Does anyone know what it could be?

Using 0w-40 synthetic and KN filter.

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Jan 3, 2021
20
8
3
Too much oil and it gets pushed out the breather. I have the same bike and the specs are .9L for full engine rebuild. periodic w/out filter its only .62 and with filter change .64.

So it’s only ~600ml for an oil change not 900ml? I must be an idiot and can’t read the service manual...


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s.e.xtreme

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Jan 14, 2008
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juneau ak
I always take the full fill bolt out and just fill until it drips out. Its in the book and also I crack open the bolt up on the cylinder to make sure its lubing. never had any come out the tube unless ive had to do a roll over.
 

Chadx

Off the trail again...just can't wait to get off t
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Feb 2, 2010
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Oil sight glass is handy and quick way to get the oil level in the right range. Not sure, but thought the 2018 has one, doesnt it?
 
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