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06 450 oil coming out breather tube!

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Have a 06 YZ 450 that just had the engine rebuilt (new piston/rings/etc). Took out for ride today and noticed there is a lot of oil coming out of the breather tube for the valve cover. A lot more than should be, almost a steady drip when the bike is on stand warm. Checked oil and it was a little low so it wasnt like there was too much oil in it. I don't know jack about the 4 stroke engines so does anyone have an idea what may be causing this?



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