I have owned an XV250. Which ran on 1 for a while.
Unless the design has changed, or my memory is bad, the TAIL pipes are not fake. I do seem to vaguely recall a "decorative" header for the rear cyl on the right side, the actual header is tucked away, again, from memory.
Anyway, you very definately have two cylinders and both very definately should fire, and running on 1 cylinder very definately makes for a workable but gutless ride.
My problem was due to the battery boiling dry when the regulator was overcharging, I bought the bike in Motueka all working, and rode back to Christchurch, 30 minutes from home there was a bang and total power loss, got it going again and got home after putting some water in the now totally dry battery, but only one cylinder. Seem to recall that it required a new coil and also the CDI needed replacing.
If a plug replacement doesn't resolve the issue, I'd take it in to a shop for them to have a look.
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