fitting 125 skipper engine in mini quad ?

arite chaps , got a wee project to do for the kids ,

we have a wee quadzilla 100cc quad which uses a 100cc minarelli styled engine , but its now shat itself , so i was looking into fitting the 125 4t skipper engine in

what you guys think will be needed auxillary wise , for starting the engine can i bypass using a key , just a matter of hitting starter and off it goes , no lights or anything like that will be required


post your ideas chaps ,