Can someone confirm for me if Yamaha PW50's have their own class separate from other PeeWee 50 bikes?

I was told this by a friend who's son used to race a while back.

Looking to get my 4 yr old into a couple races on his JR but thinking a PW class would be more suited due to his age and experience level.

Thanks

Just realized this is a classifieds section.

Maybe someone can shed some light though.

Thanks for the info..