yz250f oil leak

i was riding my yamaha and i looked at my oil window and it had know oil but it ran fine. were could off this leak came from

(there was oil all on my boots and engine)

First place to check is the external oil lines. There are 3 bolts, each with copper washer to seal up. If the bolts are loose, it will leak. Also you have to be careful with the line because if you over torque the bolts, you cans strip the head or case, or bend and crack the line. Could also be your valve cover gasket, or your oil filter cover if its on the low right side, or..... you really didn't give a lot to go on there. Clean it off and crank it so you can see where its coming from. Good luck

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