Ya know, I don't wanna even try giving an answer for that at the moment.
1man8scoots intake and reeds are on the way (
https://www.fedex.com/apps/fedextrack/? ... 4444652197 )
No more runs on the dyno will be done until it gets here. I think at minimum though, one will need a different carb. Those tiny Keihin carbs just don't have the oomph you need, and it's not just the Spree.
Take a look around the forums and you'll see a pattern. Bottom line is Keihin designed their carbs to be ran with an air box. When you upgrade to a BBK, you are asking the setup you have to do something it wasn't designed for.
Shawn at SS C&C is a 4 stroke guy, but it was very obvious to him that the entire intake/carb system on my Spree is what was holding it back. You can try a bigger jet with more air using a pod filter, but what you'll end up doing is ramming more air then the carb can process giving you a lean condition. And, like I told the other guy, the airbox fixes that, but then you have to play around with the proper holes and have less power then what the BBK can make.
Guess we will all see in a few days what the Polini with ported intake and reeds does for it.