a bit of advice

at the moment i;m running a ts1225 li150g/box 16x47 sprockets with a franspeed race pipe at the moment the power peaks at 6800 revs and starts coming in at 4000 revs i'm thinking of going to 110 x 60 crank and rod i'm looking for more low down power i was thinking of fitting a nk road pipe or a franspeed super tourer any ideas thanks 
