I actually emptied the catch can before the test, but it was about halfway full so maybe the oil had slicked up the engine too much already anyways. I have actually had the rear spark plugs foul up before and had to clean them - I will definitely check them for gunk. I will be replacing all of the plugs anyways so this should be a good indicator. Thanks!Okay. Five years straight, you passed the test. Last year you added the catch can. You did not say if you tested last year before or after you installed that can but I am thinking that you did not test at all given the limited amount of road time you suggest occurred.
This year you tested and El Flunko! Were it me I would be looking at the last item to be installed that could have an adverse affect on the emissions; in my mind that would be that oil catch can between the PCV and the manifold. The question in my mind is what happens to the oil mist that condenses in that can once it has filled up? Under normal conditions the PCV doesn't send liquids it sends a sort of light to heavy mist back to the manifold to be incorporated back into the air/fuel mixture. It sort of sounds to me like that can got full and then, during the test, dumped its entire contents into the manifold at once. Way too much oil for the engine to consume and expell. Contemporary two-strokes mix at around 40 to 1 or possibly leaner now. What your engine may have received would have been way richer in ratio by twice as much or worse.
At this point, I would be pulling the plugs to see what the tips look like. The tip off will be a plug tip that is absolutely black and oil fouled and stinking of burnt oil from attempted combustion. Instead of pulling #1 first, head to the firewall and pull #7 and #8. Sometimes they tend to foul out first and could show a good indication of what the rest look like.