I've been running the 19T sprocket since day one. with the modifications (Freak,jets,EPCO Exhuast, K&N Filters,Drilled slides,etc...)I haven't had to install the bigbore kit I purchased. Just letting her breath will give you enough power to use the 19T.

1200CC BIG BORE, W/WISECO PISTONS,.250 STROKED CRANK, PORTED/POLISHED HEADS AND LARGER VALVES, CUSTOM WELDED EXHUAST, DUAL 42MM MIKUNI CARBS.