Header Changes & Won't start

I recently purchased an 03 YZ450F. I wanted to take the mega bomb header off and put the stock back on it. I did it, and then the bike wouldn't start, must have kicked it 100 times, I put the mega bomb back on and it started up within a few kicks. I'm confused? Any input?

Thanks!

Just for fun, you might see if someone has plugged up the other header with something. Otherwise, I'd have to say it was entirely coincidental.

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