So, I cleaned and tuned and replaced everything on my 1978 Puch Newport. I don't want to mess with the gear ratio until I have some more power. I don't think I'm ready to start porting just yet. What sort of modifications will increase HP? I am sorta new and have read about different carb sizes and jet sizes and heads etc. I have seen all sorts of advertisements 60 or 70 CC heads and big bore kits, but can someone explain what they do? I understand the basics of how the carb gets air/fuel into the cylinder and how that combusts to shove the piston, but beyond that I am a little fuzzy....