400CC quad sport class

I was told that last year someone was running a modified cylinder in this class making thier quad a 440CC. I didn't see anything on your site that shows any rules on this class as far as motor mods. Can you clarify if this is legal for your series? And how should a racer handle this, if mods are not allowed, and they see one on the line? Thanks.

Don't know the rules. Sounds like cheating to me but the problem is most of the time they just bore out stock cylinder and sleeve it so u can't tell by looking at it from outside. Only way to check is pull head n measure which isn't gonna happen