Perhaps I wasn't clear in my question.
What I am after is the net HP and Torque increase of the 904 TPUSA BB kit when installed on a 865 Carb motor.
Previous post's quote 16 BHP and 8 LB TQ increase but, they never clarify whether it is a 790 or 865 (Carb or EFI).
Using the numbers listed from Triumph Twin Power, one can easily see that each motor has a different starting point. If you where only adding 39cc (865 to 904), basic engineering fundamentals would indicate you were not adding as much as 114cc (790 to 904).
790 61bhp @ 7,400rpm 44.3ft.lbf @ 3,500rpm
865 54bhp @ 6,750rpm 51ft.lbf @ 4,800rpm
865 EFI 61bhp @ 6,800rpm 55ft.lbf @ 3,300rpm
