You can check out the specs on the Novarossi website Josh.
Plus 21-7BT
http://www.novarossi.it/eng/motori/plus217b7bt.htm
Plus 21-5T
http://www.novarossi.it/eng/motori/plus215.htm
Approximately .22 of a horsepower difference which is a bit for one of these little engines.
The 7BT is more of a mid to top end power engine i'm guessing and the 5T is more of a bottom to mid range engine.
I haven't cranked over my 7BT yet but i'm looking forward to doing it very soon.
I've run in the 5T now and fully dialed it in on the weekend gone...man what a screamer!
This thing has enormous but smooth and controlable power.
It is also very easy to tune compared to my last Novarossi.
I gotta say to anyone looking to buy an engine that these are well worth the little bit extra you pay for them.
I'm impressed!
