wireing probem etc on pit bike?

i have a few questions i.m hoping some 1 can help me . i had a 125 pit bike un sure of what make . well i had to replace the engin. of whitch i have now put in a 70cc honda but i"am stuck as to weather i can put the same carbureta of the 125 on it and also stuck with the wireing i"m needing to now whitch ones go were the old bike wire"s are blues and red"s . but there are 5 wires from the 70 engin 2 of witch are joined together and all diferent coulers . would much apreciate it if any 1 can help or advise me thanks . chris .