How Strict is Illinois on it's Motorcycle Engine CC license requirements?

I was doing my research and found that for motorcycles/scooters anything less than 150cc requires a class L license and anything over 150cc requires a class M in the state of Illinois. I was looking at the Honda PCX150, which based on Honda's specs, has a 153cc engine in it. Now I know that's over the 150 mark, but I was curious if anyone know from experience if the Illinois DMV is willing to let 3cc slip and allow it to be operated under a class L license.

Illinois goes right at 150 cc and if you have 151cc you're on a 'motorcycle'. When I lived in Illinois I had a 150 Honda dream that had 154cc engine- it got the full motorcycle plates and was allowed on interstate system. Friends 150 Yamaha was 147cc and wasn't plated as motorcycle, not allowed on interstate- and it was couple hp more than the Honda 13hp, 10 mph faster.

Sorry, don't know Ill. Laws but I do believe that IF anything happens that involves insurance and you are operating even that little bit over the limit you will be screwed.