I bought the New Hero Honda Hunk around 4 months ago and clocked 4100km. I've been on long rides to some of the Hills etc. I'm happy with the performance, but still think a bit more can be done. I don't wish to modify the stock engine in anyway. But would like to make the bike faster. The top whack I've gotten till date is 114kmph. And I'd like to go at the 125 mark. Is it possible? I've been responsibility a lot of reading and I've come across a few things. Could you guys suggest the average cost and the speed difference it'll make?