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No, plugs shouldn't be fouled at 40 miles. What fouled mine was rolling the quad onto its left side or all the way over. Oil gets into the airbox and is sucked into the cylinders.
i had a buddy roll his 800 over and got oil in the airbox. i have rolled my 650 over on both sides and have yet to see oil...maybe it wasnt over long enough???
I guess you've looked in your air box. Oil comes into it when it's on its left side and the airbox is downhill from the tires. It does take a few minutes to get there, like 3 or 4 minutes.