There are a ton of mods you can do to wake your shee up. You can get some aftermarket exhaust and reeds, put a timing plate and advance the timing, put a K&N on it, etc etc. Make sure you jet the carbs to your mods though so you don't end up with a mess. I am not positive but I think that 68mm may be the max bore you can get outta stock jugs. You will have to rip into her and see what you got for sure and go from there. Welcome to the HQ!