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yz 250 fouling plugs left and right

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We put in a brand new spark plug, then a couple days later it wouldn't start. Soo we picked up a couple extras and have went through both in the past week, After riding on the plug for about 2-3 days it fouls? What could cause this?

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Could be jetting. Possibly too much oil in the gas. But possibly you need to ride it a little harder. I am assuming that your plug is a number 8 for the YZ250, correct??? Hopefully your clutch side crankshaft main seal is not leaking. Does the smoke smell like two stroke oil or like an old oil burning car?

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the plug is a NGK B8EG, it could be that I need to open it up more, just got back to riding alot and their isn't alot of room on my property so that might be it. It smells like two stroke smoke for sure.

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