47cc vs 49cc

k, theres a guy i no who sells pocketbikes, hes sellin 47cc and 49cc full farings, the 49cc is the exact same size, just bigger engine
i just had a stock 47cc ff and i liked but sold, now i want something a little bit more powerful but looks the same so i thinkk i found it
but my ? is...does a 49cc give more noticable speed and power and is it easy to mod

the cag pocket bikes are all about 39cc, evn tho advertisers may say 47 or 49, if u add a big bore 44mm head kit, you'll get up to about 48cc, thats almost a 25% gain and that i can gaurentee u a noticable gain

their are 3 different cags 40cc 47cc 49cc

i dont think u can get 47cc engine in these bore and stroke wise...the 44mm kit gave me better all round power, now all i gotta do is lighten up piston to really make it perform