i was wondering how much upside do u think the 450 engine has, like i know the banshee has insane upside, but i havent heard too much about the yfz?

 

I assume you mean top end and revs. The banshee has such high topend and rev capabilities because it is a twin cylinder 2 stroke. The yfz is a dohc 4stroke single cyl. That means it doesnt create near the revs that the shee has, but it does make considerably more than other sohc or ohv 4 stroke engines.