Ok, I've got my first moped - a 1978 Vespa Grande Deluxe. It goes about 25-27 with the stock 12.12 carb, air filter, and pipe (it looks like there's actually a dented hole in the exhaust in addition to the normal opening). I'd like it to be just a tad faster in traffic. Can I simply swap in a 13.13 carb (upjetting of course, probably gonna try something in the 60s), a high flow filter, and a performance pipe? Or do I have to do something to the engine? I know people up the cc's with kits, but being totally new to the craft, I'm not sure if I need to do anything to the engine (e.g. bore out the intake to 13mm, etc.). I'm just looking for a little speed improvement. Essentially, if I run a few upgraded performance parts at 50cc, will they even do anything? I know there are other threads about this, but if someone is willing to give something of a beginner's breakdown, I'd be most appreciative.