Probley could get the vin number off of it and find out more info. For straight piping. If its a 2-stroke you would have to leave the header pipe (fatty pipe) on and you could probley straight pipe from that and not use a silencer although that is going to be very loud. Also you would run was lean so your going to have to adjust for that so I would just leave it. We have an old Trail Flite 4-stroke mini bike we straight piped and it runs fine so if its a 4-stroke that might be fine. If its a 4-stroke your gonna need to use 10-40 oil. If its a 2 stroke your gonna want to use 10-40 for your tranny oil and 2-stroke premix to mix with your gas.
from a quick google search of pics it looks like fly wing had 4-strokes but i am not sure. if you get the vin you can find out.
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