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Pour a gallon or two through the outlet port.

Me to Got an yz250f 2019

Let me know if you figure it out and I will do the same! Cheers

@@Schylle okay so I was being an idiot. I was putting the cam cap back on the intake before adjusting the exhaust cam. The trick is to line up your flywheel and then drop in both cams and pull the chain slack over your intake, over the sprocket, and then you'll have enough slack to adjust the exhaust and put the chain over it. Once you have adjusted the dots perfectly double check the flywheel mark (would be nice to have a friend hold it so it doesn't move the whole time). On my YZ there should be 14 pin links in between the double dots. Once everything is all good, put your cam caps back on and torque them, release the cam chain tensioner and you're good. Also my TDC was not factory timing marks. I put the flywheel on crooked. I inspected the motor through the spark plug hole to find TDC and made a mark on the flywheel with a sharpie and adjusted from that.

@@AlanHendricks Thank you so much Alan this was really helpful! I have done done like you said and checked the TDC and everything seems ok. The markings on the exhaustcam are still 1-2mm off but maybe it’s because the motor has 155 hours on it and the timechain has 50h. I will also try to check that the exhaustcam/sprocket is inline. Greetings from sweden!

It might take a second set of hands. Use a socket on the crank to hold it at top dead center then install the cams.