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Yz250f hard to start

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I have a yz250f 2003! It's hard to start and we roll start it and it starts and when I give it some gas oil comes out of the vent house on top of the head! Any ideas on why it's doing that?

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What about the piston and rings?

you don't check that per se, what you do is a compression test... but i agree with the above, start with checking your valve lash.

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What about the piston and rings?

Still stuck in the world of 2 strokes lol. Valves can be checked in minutes a lot easier than pulling the cylinder! Need some thin feeler gauges, my princess auto ones work great for under ten bucks.

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